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<div id="unreleased-message"> You are reading an old version of the documentation (v3.1.0). For the latest version see <a href="https://matplotlib.org/stable/api/dates_api.html">https://matplotlib.org/stable/api/dates_api.html</a></div>
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<li><a class="reference internal" href="#"><code class="docutils literal notranslate"><span class="pre">matplotlib.dates</span></code></a><ul>
<li><a class="reference internal" href="#matplotlib-date-format">Matplotlib date format</a></li>
<li><a class="reference internal" href="#date-tickers">Date tickers</a></li>
<li><a class="reference internal" href="#date-formatters">Date formatters</a></li>
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<div class="section" id="matplotlib-dates">
<h1><code class="docutils literal notranslate"><span class="pre">matplotlib.dates</span></code><a class="headerlink" href="#matplotlib-dates" title="Permalink to this headline">¶</a></h1>
<div class="graphviz"><img src="../_images/inheritance-d9d4b2873ad1e532a45204b23da0ff3afb1d0ea7.png" alt="Inheritance diagram of matplotlib.dates" usemap="#inheritance1bda3e63b5" class="inheritance graphviz" /></div>
<map id="inheritance1bda3e63b5" name="inheritance1bda3e63b5">
<area shape="rect" id="node1" href="#matplotlib.dates.AutoDateFormatter" target="_top" title="This class attempts to figure out the best format to use.  This is" alt="" coords="326,126,446,146"/>
<area shape="rect" id="node2" href="ticker_api.html#matplotlib.ticker.Formatter" target="_top" title="Create a string based on a tick value and location." alt="" coords="188,206,259,227"/>
<area shape="rect" id="node7" href="#matplotlib.dates.ConciseDateFormatter" target="_top" title="This class attempts to figure out the best format to use for the" alt="" coords="317,166,454,187"/>
<area shape="rect" id="node9" href="#matplotlib.dates.DateFormatter" target="_top" title="Tick location is seconds since the epoch.  Use a :func:`strftime`" alt="" coords="338,206,434,227"/>
<area shape="rect" id="node15" href="#matplotlib.dates.IndexDateFormatter" target="_top" title="Use with :class:`~matplotlib.ticker.IndexLocator` to cycle format" alt="" coords="323,247,448,268"/>
<area shape="rect" id="node3" href="#matplotlib.dates.AutoDateLocator" target="_top" title="On autoscale, this class picks the best" alt="" coords="502,226,609,247"/>
<area shape="rect" id="node4" href="#matplotlib.dates.DateLocator" target="_top" title="Determines the tick locations when plotting dates." alt="" coords="344,287,427,308"/>
<area shape="rect" id="node12" href="#matplotlib.dates.RRuleLocator" target="_top" title="RRuleLocator" alt="" coords="512,267,599,287"/>
<area shape="rect" id="node16" href="#matplotlib.dates.MicrosecondLocator" target="_top" title="Make ticks on regular intervals of one or more microsecond(s)." alt="" coords="494,307,617,328"/>
<area shape="rect" id="node21" href="#matplotlib.dates.YearLocator" target="_top" title="Make ticks on a given day of each year that is a multiple of base." alt="" coords="516,347,595,368"/>
<area shape="rect" id="node8" href="units_api.html#matplotlib.units.ConversionInterface" target="_top" title="The minimal interface for a converter to take custom data types (or" alt="" coords="4,85,130,106"/>
<area shape="rect" id="node10" href="ticker_api.html#matplotlib.ticker.Locator" target="_top" title="Determine the tick locations;" alt="" coords="194,268,253,288"/>
<area shape="rect" id="node11" href="#matplotlib.dates.DayLocator" target="_top" title="Make ticks on occurrences of each day of the month.  For example," alt="" coords="671,165,749,186"/>
<area shape="rect" id="node14" href="#matplotlib.dates.HourLocator" target="_top" title="Make ticks on occurrences of each hour." alt="" coords="669,205,752,226"/>
<area shape="rect" id="node17" href="#matplotlib.dates.MinuteLocator" target="_top" title="Make ticks on occurrences of each minute." alt="" coords="663,246,757,267"/>
<area shape="rect" id="node18" href="#matplotlib.dates.MonthLocator" target="_top" title="Make ticks on occurrences of each month, e.g., 1, 3, 12." alt="" coords="665,286,755,307"/>
<area shape="rect" id="node19" href="#matplotlib.dates.SecondLocator" target="_top" title="Make ticks on occurrences of each second." alt="" coords="662,327,758,347"/>
<area shape="rect" id="node20" href="#matplotlib.dates.WeekdayLocator" target="_top" title="Make ticks on occurrences of each weekday." alt="" coords="657,367,764,388"/>
<area shape="rect" id="node13" href="ticker_api.html#matplotlib.ticker.TickHelper" target="_top" title="TickHelper" alt="" coords="29,227,105,248"/>
</map><span class="target" id="module-matplotlib.dates"></span><p>Matplotlib provides sophisticated date plotting capabilities, standing on the
shoulders of python <a class="reference external" href="https://docs.python.org/3/library/datetime.html#module-datetime" title="(in Python v3.7)"><code class="xref py py-mod docutils literal notranslate"><span class="pre">datetime</span></code></a> and the add-on module <code class="xref py py-mod docutils literal notranslate"><span class="pre">dateutil</span></code>.</p>
<div class="section" id="matplotlib-date-format">
<span id="date-format"></span><h2>Matplotlib date format<a class="headerlink" href="#matplotlib-date-format" title="Permalink to this headline">¶</a></h2>
<p>Matplotlib represents dates using floating point numbers specifying the number
of days since 0001-01-01 UTC, plus 1. For example, 0001-01-01, 06:00 is 1.25,
not 0.25. Values < 1, i.e. dates before 0001-01-01 UTC are not supported.</p>
<p>There are a number of helper functions to convert between <a class="reference external" href="https://docs.python.org/3/library/datetime.html#module-datetime" title="(in Python v3.7)"><code class="xref py py-mod docutils literal notranslate"><span class="pre">datetime</span></code></a>
objects and Matplotlib dates:</p>
<table border="1" class="longtable docutils">
<colgroup>
<col width="10%" />
<col width="90%" />
</colgroup>
<tbody valign="top">
<tr class="row-odd"><td><a class="reference internal" href="#matplotlib.dates.datestr2num" title="matplotlib.dates.datestr2num"><code class="xref py py-obj docutils literal notranslate"><span class="pre">datestr2num</span></code></a></td>
<td>Convert a date string to a datenum using <code class="xref py py-func docutils literal notranslate"><span class="pre">dateutil.parser.parse()</span></code>.</td>
</tr>
<tr class="row-even"><td><a class="reference internal" href="#matplotlib.dates.date2num" title="matplotlib.dates.date2num"><code class="xref py py-obj docutils literal notranslate"><span class="pre">date2num</span></code></a></td>
<td>Convert datetime objects to Matplotlib dates.</td>
</tr>
<tr class="row-odd"><td><a class="reference internal" href="#matplotlib.dates.num2date" title="matplotlib.dates.num2date"><code class="xref py py-obj docutils literal notranslate"><span class="pre">num2date</span></code></a></td>
<td>Convert Matplotlib dates to <a class="reference external" href="https://docs.python.org/3/library/datetime.html#datetime.datetime" title="(in Python v3.7)"><code class="xref py py-obj docutils literal notranslate"><span class="pre">datetime</span></code></a> objects.</td>
</tr>
<tr class="row-even"><td><a class="reference internal" href="#matplotlib.dates.num2timedelta" title="matplotlib.dates.num2timedelta"><code class="xref py py-obj docutils literal notranslate"><span class="pre">num2timedelta</span></code></a></td>
<td>Convert number of days to a <a class="reference external" href="https://docs.python.org/3/library/datetime.html#datetime.timedelta" title="(in Python v3.7)"><code class="xref py py-obj docutils literal notranslate"><span class="pre">timedelta</span></code></a> object.</td>
</tr>
<tr class="row-odd"><td><a class="reference internal" href="#matplotlib.dates.epoch2num" title="matplotlib.dates.epoch2num"><code class="xref py py-obj docutils literal notranslate"><span class="pre">epoch2num</span></code></a></td>
<td>Convert an epoch or sequence of epochs to the new date format, that is days since 0001.</td>
</tr>
<tr class="row-even"><td><a class="reference internal" href="#matplotlib.dates.num2epoch" title="matplotlib.dates.num2epoch"><code class="xref py py-obj docutils literal notranslate"><span class="pre">num2epoch</span></code></a></td>
<td>Convert days since 0001 to epoch.</td>
</tr>
<tr class="row-odd"><td><a class="reference internal" href="#matplotlib.dates.mx2num" title="matplotlib.dates.mx2num"><code class="xref py py-obj docutils literal notranslate"><span class="pre">mx2num</span></code></a></td>
<td>Convert mx <code class="xref py py-class docutils literal notranslate"><span class="pre">datetime</span></code> instance (or sequence of mx instances) to the new date format.</td>
</tr>
<tr class="row-even"><td><a class="reference internal" href="#matplotlib.dates.drange" title="matplotlib.dates.drange"><code class="xref py py-obj docutils literal notranslate"><span class="pre">drange</span></code></a></td>
<td>Return a sequence of equally spaced Matplotlib dates.</td>
</tr>
</tbody>
</table>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p>Like Python's datetime, mpl uses the Gregorian calendar for all
conversions between dates and floating point numbers. This practice
is not universal, and calendar differences can cause confusing
differences between what Python and mpl give as the number of days
since 0001-01-01 and what other software and databases yield. For
example, the US Naval Observatory uses a calendar that switches
from Julian to Gregorian in October, 1582. Hence, using their
calculator, the number of days between 0001-01-01 and 2006-04-01 is
732403, whereas using the Gregorian calendar via the datetime
module we find:</p>
<div class="last highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">In</span> <span class="p">[</span><span class="mi">1</span><span class="p">]:</span> <span class="n">date</span><span class="p">(</span><span class="mi">2006</span><span class="p">,</span> <span class="mi">4</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span><span class="o">.</span><span class="n">toordinal</span><span class="p">()</span> <span class="o">-</span> <span class="n">date</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span><span class="o">.</span><span class="n">toordinal</span><span class="p">()</span>
<span class="n">Out</span><span class="p">[</span><span class="mi">1</span><span class="p">]:</span> <span class="mi">732401</span>
</pre></div>
</div>
</div>
<p>All the Matplotlib date converters, tickers and formatters are timezone aware.
If no explicit timezone is provided, the rcParam <code class="docutils literal notranslate"><span class="pre">timezone</span></code> is assumed. If
you want to use a custom time zone, pass a <a class="reference external" href="https://docs.python.org/3/library/datetime.html#datetime.tzinfo" title="(in Python v3.7)"><code class="xref py py-class docutils literal notranslate"><span class="pre">datetime.tzinfo</span></code></a> instance
with the tz keyword argument to <a class="reference internal" href="#matplotlib.dates.num2date" title="matplotlib.dates.num2date"><code class="xref py py-func docutils literal notranslate"><span class="pre">num2date()</span></code></a>, <a class="reference internal" href="_as_gen/matplotlib.pyplot.plot_date.html#matplotlib.pyplot.plot_date" title="matplotlib.pyplot.plot_date"><code class="xref py py-func docutils literal notranslate"><span class="pre">plot_date()</span></code></a>, and any
custom date tickers or locators you create.</p>
<p>A wide range of specific and general purpose date tick locators and
formatters are provided in this module. See
<a class="reference internal" href="ticker_api.html#module-matplotlib.ticker" title="matplotlib.ticker"><code class="xref py py-mod docutils literal notranslate"><span class="pre">matplotlib.ticker</span></code></a> for general information on tick locators
and formatters. These are described below.</p>
<p>The <a class="reference external" href="https://dateutil.readthedocs.io">dateutil</a> module provides additional code to handle date ticking, making it
easy to place ticks on any kinds of dates. See examples below.</p>
</div>
<div class="section" id="date-tickers">
<h2>Date tickers<a class="headerlink" href="#date-tickers" title="Permalink to this headline">¶</a></h2>
<p>Most of the date tickers can locate single or multiple values. For
example:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="c1"># import constants for the days of the week</span>
<span class="kn">from</span> <span class="nn">matplotlib.dates</span> <span class="k">import</span> <span class="n">MO</span><span class="p">,</span> <span class="n">TU</span><span class="p">,</span> <span class="n">WE</span><span class="p">,</span> <span class="n">TH</span><span class="p">,</span> <span class="n">FR</span><span class="p">,</span> <span class="n">SA</span><span class="p">,</span> <span class="n">SU</span>
<span class="c1"># tick on mondays every week</span>
<span class="n">loc</span> <span class="o">=</span> <span class="n">WeekdayLocator</span><span class="p">(</span><span class="n">byweekday</span><span class="o">=</span><span class="n">MO</span><span class="p">,</span> <span class="n">tz</span><span class="o">=</span><span class="n">tz</span><span class="p">)</span>
<span class="c1"># tick on mondays and saturdays</span>
<span class="n">loc</span> <span class="o">=</span> <span class="n">WeekdayLocator</span><span class="p">(</span><span class="n">byweekday</span><span class="o">=</span><span class="p">(</span><span class="n">MO</span><span class="p">,</span> <span class="n">SA</span><span class="p">))</span>
</pre></div>
</div>
<p>In addition, most of the constructors take an interval argument:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="c1"># tick on mondays every second week</span>
<span class="n">loc</span> <span class="o">=</span> <span class="n">WeekdayLocator</span><span class="p">(</span><span class="n">byweekday</span><span class="o">=</span><span class="n">MO</span><span class="p">,</span> <span class="n">interval</span><span class="o">=</span><span class="mi">2</span><span class="p">)</span>
</pre></div>
</div>
<p>The rrule locator allows completely general date ticking:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="c1"># tick every 5th easter</span>
<span class="n">rule</span> <span class="o">=</span> <span class="n">rrulewrapper</span><span class="p">(</span><span class="n">YEARLY</span><span class="p">,</span> <span class="n">byeaster</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="n">interval</span><span class="o">=</span><span class="mi">5</span><span class="p">)</span>
<span class="n">loc</span> <span class="o">=</span> <span class="n">RRuleLocator</span><span class="p">(</span><span class="n">rule</span><span class="p">)</span>
</pre></div>
</div>
<p>Here are all the date tickers:</p>
<blockquote>
<div><ul class="simple">
<li><a class="reference internal" href="#matplotlib.dates.MicrosecondLocator" title="matplotlib.dates.MicrosecondLocator"><code class="xref py py-class docutils literal notranslate"><span class="pre">MicrosecondLocator</span></code></a>: locate microseconds</li>
<li><a class="reference internal" href="#matplotlib.dates.SecondLocator" title="matplotlib.dates.SecondLocator"><code class="xref py py-class docutils literal notranslate"><span class="pre">SecondLocator</span></code></a>: locate seconds</li>
<li><a class="reference internal" href="#matplotlib.dates.MinuteLocator" title="matplotlib.dates.MinuteLocator"><code class="xref py py-class docutils literal notranslate"><span class="pre">MinuteLocator</span></code></a>: locate minutes</li>
<li><a class="reference internal" href="#matplotlib.dates.HourLocator" title="matplotlib.dates.HourLocator"><code class="xref py py-class docutils literal notranslate"><span class="pre">HourLocator</span></code></a>: locate hours</li>
<li><a class="reference internal" href="#matplotlib.dates.DayLocator" title="matplotlib.dates.DayLocator"><code class="xref py py-class docutils literal notranslate"><span class="pre">DayLocator</span></code></a>: locate specified days of the month</li>
<li><a class="reference internal" href="#matplotlib.dates.WeekdayLocator" title="matplotlib.dates.WeekdayLocator"><code class="xref py py-class docutils literal notranslate"><span class="pre">WeekdayLocator</span></code></a>: Locate days of the week, e.g., MO, TU</li>
<li><a class="reference internal" href="#matplotlib.dates.MonthLocator" title="matplotlib.dates.MonthLocator"><code class="xref py py-class docutils literal notranslate"><span class="pre">MonthLocator</span></code></a>: locate months, e.g., 7 for july</li>
<li><a class="reference internal" href="#matplotlib.dates.YearLocator" title="matplotlib.dates.YearLocator"><code class="xref py py-class docutils literal notranslate"><span class="pre">YearLocator</span></code></a>: locate years that are multiples of base</li>
<li><a class="reference internal" href="#matplotlib.dates.RRuleLocator" title="matplotlib.dates.RRuleLocator"><code class="xref py py-class docutils literal notranslate"><span class="pre">RRuleLocator</span></code></a>: locate using a <code class="xref py py-obj docutils literal notranslate"><span class="pre">matplotlib.dates.rrulewrapper</span></code>.
<code class="xref py py-obj docutils literal notranslate"><span class="pre">rrulewrapper</span></code> is a simple wrapper around <a class="reference external" href="https://dateutil.readthedocs.io">dateutil</a>'s <a class="reference external" href="https://dateutil.readthedocs.io/en/stable/rrule.html#module-dateutil.rrule" title="(in dateutil v2.8.0)"><code class="xref py py-obj docutils literal notranslate"><span class="pre">dateutil.rrule</span></code></a>
which allow almost arbitrary date tick specifications. See <a class="reference internal" href="../gallery/ticks_and_spines/date_demo_rrule.html"><span class="doc">rrule
example</span></a>.</li>
<li><a class="reference internal" href="#matplotlib.dates.AutoDateLocator" title="matplotlib.dates.AutoDateLocator"><code class="xref py py-class docutils literal notranslate"><span class="pre">AutoDateLocator</span></code></a>: On autoscale, this class picks the best
<a class="reference internal" href="#matplotlib.dates.DateLocator" title="matplotlib.dates.DateLocator"><code class="xref py py-class docutils literal notranslate"><span class="pre">DateLocator</span></code></a> (e.g., <a class="reference internal" href="#matplotlib.dates.RRuleLocator" title="matplotlib.dates.RRuleLocator"><code class="xref py py-class docutils literal notranslate"><span class="pre">RRuleLocator</span></code></a>)
to set the view limits and the tick
locations. If called with <code class="docutils literal notranslate"><span class="pre">interval_multiples=True</span></code> it will
make ticks line up with sensible multiples of the tick intervals. E.g.
if the interval is 4 hours, it will pick hours 0, 4, 8, etc as ticks.
This behaviour is not guaranteed by default.</li>
</ul>
</div></blockquote>
</div>
<div class="section" id="date-formatters">
<h2>Date formatters<a class="headerlink" href="#date-formatters" title="Permalink to this headline">¶</a></h2>
<p>Here all all the date formatters:</p>
<blockquote>
<div><ul class="simple">
<li><a class="reference internal" href="#matplotlib.dates.AutoDateFormatter" title="matplotlib.dates.AutoDateFormatter"><code class="xref py py-class docutils literal notranslate"><span class="pre">AutoDateFormatter</span></code></a>: attempts to figure out the best format
to use. This is most useful when used with the <a class="reference internal" href="#matplotlib.dates.AutoDateLocator" title="matplotlib.dates.AutoDateLocator"><code class="xref py py-class docutils literal notranslate"><span class="pre">AutoDateLocator</span></code></a>.</li>
<li><a class="reference internal" href="#matplotlib.dates.ConciseDateFormatter" title="matplotlib.dates.ConciseDateFormatter"><code class="xref py py-class docutils literal notranslate"><span class="pre">ConciseDateFormatter</span></code></a>: also attempts to figure out the best
format to use, and to make the format as compact as possible while
still having complete date information. This is most useful when used
with the <a class="reference internal" href="#matplotlib.dates.AutoDateLocator" title="matplotlib.dates.AutoDateLocator"><code class="xref py py-class docutils literal notranslate"><span class="pre">AutoDateLocator</span></code></a>.</li>
<li><a class="reference internal" href="#matplotlib.dates.DateFormatter" title="matplotlib.dates.DateFormatter"><code class="xref py py-class docutils literal notranslate"><span class="pre">DateFormatter</span></code></a>: use <code class="xref py py-func docutils literal notranslate"><span class="pre">strftime()</span></code> format strings</li>
<li><a class="reference internal" href="#matplotlib.dates.IndexDateFormatter" title="matplotlib.dates.IndexDateFormatter"><code class="xref py py-class docutils literal notranslate"><span class="pre">IndexDateFormatter</span></code></a>: date plots with implicit <em>x</em>
indexing.</li>
</ul>
</div></blockquote>
<dl class="function">
<dt id="matplotlib.dates.datestr2num">
<code class="descclassname">matplotlib.dates.</code><code class="descname">datestr2num</code><span class="sig-paren">(</span><em>d</em>, <em>default=None</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#datestr2num"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.datestr2num" title="Permalink to this definition">¶</a></dt>
<dd><p>Convert a date string to a datenum using <code class="xref py py-func docutils literal notranslate"><span class="pre">dateutil.parser.parse()</span></code>.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><dl class="first last docutils">
<dt><strong>d</strong> <span class="classifier-delimiter">:</span> <span class="classifier">string or sequence of strings</span></dt>
<dd><p class="first last">The dates to convert.</p>
</dd>
<dt><strong>default</strong> <span class="classifier-delimiter">:</span> <span class="classifier">datetime instance, optional</span></dt>
<dd><p class="first last">The default date to use when fields are missing in <em>d</em>.</p>
</dd>
</dl>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="function">
<dt id="matplotlib.dates.date2num">
<code class="descclassname">matplotlib.dates.</code><code class="descname">date2num</code><span class="sig-paren">(</span><em>d</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#date2num"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.date2num" title="Permalink to this definition">¶</a></dt>
<dd><p>Convert datetime objects to Matplotlib dates.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><dl class="first docutils">
<dt><strong>d</strong> <span class="classifier-delimiter">:</span> <span class="classifier"><a class="reference external" href="https://docs.python.org/3/library/datetime.html#datetime.datetime" title="(in Python v3.7)"><code class="xref py py-obj docutils literal notranslate"><span class="pre">datetime.datetime</span></code></a> or <code class="xref py py-obj docutils literal notranslate"><span class="pre">numpy.datetime64</span></code> or sequences of these</span></dt>
<dd></dd>
</dl>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><dl class="first last docutils">
<dt>float or sequence of floats</dt>
<dd><p class="first last">Number of days (fraction part represents hours, minutes, seconds, ms)
since 0001-01-01 00:00:00 UTC, plus one.</p>
</dd>
</dl>
</td>
</tr>
</tbody>
</table>
<p class="rubric">Notes</p>
<p>The addition of one here is a historical artifact. Also, note that the
Gregorian calendar is assumed; this is not universal practice.
For details see the module docstring.</p>
</dd></dl>
<dl class="function">
<dt id="matplotlib.dates.num2date">
<code class="descclassname">matplotlib.dates.</code><code class="descname">num2date</code><span class="sig-paren">(</span><em>x</em>, <em>tz=None</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#num2date"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.num2date" title="Permalink to this definition">¶</a></dt>
<dd><p>Convert Matplotlib dates to <a class="reference external" href="https://docs.python.org/3/library/datetime.html#datetime.datetime" title="(in Python v3.7)"><code class="xref py py-obj docutils literal notranslate"><span class="pre">datetime</span></code></a> objects.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><dl class="first docutils">
<dt><strong>x</strong> <span class="classifier-delimiter">:</span> <span class="classifier">float or sequence of floats</span></dt>
<dd><p class="first last">Number of days (fraction part represents hours, minutes, seconds)
since 0001-01-01 00:00:00 UTC, plus one.</p>
</dd>
<dt><strong>tz</strong> <span class="classifier-delimiter">:</span> <span class="classifier">string, optional</span></dt>
<dd><p class="first last">Timezone of <em>x</em> (defaults to rcparams <code class="docutils literal notranslate"><span class="pre">timezone</span></code>).</p>
</dd>
</dl>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><dl class="first last docutils">
<dt><a class="reference external" href="https://docs.python.org/3/library/datetime.html#datetime.datetime" title="(in Python v3.7)"><code class="xref py py-obj docutils literal notranslate"><span class="pre">datetime</span></code></a> or sequence of <a class="reference external" href="https://docs.python.org/3/library/datetime.html#datetime.datetime" title="(in Python v3.7)"><code class="xref py py-obj docutils literal notranslate"><span class="pre">datetime</span></code></a></dt>
<dd><p class="first">Dates are returned in timezone <em>tz</em>.</p>
<p class="last">If <em>x</em> is a sequence, a sequence of <code class="xref py py-class docutils literal notranslate"><span class="pre">datetime</span></code> objects will
be returned.</p>
</dd>
</dl>
</td>
</tr>
</tbody>
</table>
<p class="rubric">Notes</p>
<p>The addition of one here is a historical artifact. Also, note that the
Gregorian calendar is assumed; this is not universal practice.
For details, see the module docstring.</p>
</dd></dl>
<dl class="function">
<dt id="matplotlib.dates.num2timedelta">
<code class="descclassname">matplotlib.dates.</code><code class="descname">num2timedelta</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#num2timedelta"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.num2timedelta" title="Permalink to this definition">¶</a></dt>
<dd><p>Convert number of days to a <a class="reference external" href="https://docs.python.org/3/library/datetime.html#datetime.timedelta" title="(in Python v3.7)"><code class="xref py py-obj docutils literal notranslate"><span class="pre">timedelta</span></code></a> object.</p>
<p>If <em>x</em> is a sequence, a sequence of <a class="reference external" href="https://docs.python.org/3/library/datetime.html#datetime.timedelta" title="(in Python v3.7)"><code class="xref py py-obj docutils literal notranslate"><span class="pre">timedelta</span></code></a> objects will
be returned.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><dl class="first docutils">
<dt><strong>x</strong> <span class="classifier-delimiter">:</span> <span class="classifier">float, sequence of floats</span></dt>
<dd><p class="first last">Number of days. The fraction part represents hours, minutes, seconds.</p>
</dd>
</dl>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><dl class="first last docutils">
<dt><a class="reference external" href="https://docs.python.org/3/library/datetime.html#datetime.timedelta" title="(in Python v3.7)"><code class="xref py py-obj docutils literal notranslate"><span class="pre">datetime.timedelta</span></code></a> or list[<a class="reference external" href="https://docs.python.org/3/library/datetime.html#datetime.timedelta" title="(in Python v3.7)"><code class="xref py py-obj docutils literal notranslate"><span class="pre">datetime.timedelta</span></code></a>]</dt>
<dd></dd>
</dl>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="function">
<dt id="matplotlib.dates.drange">
<code class="descclassname">matplotlib.dates.</code><code class="descname">drange</code><span class="sig-paren">(</span><em>dstart</em>, <em>dend</em>, <em>delta</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#drange"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.drange" title="Permalink to this definition">¶</a></dt>
<dd><p>Return a sequence of equally spaced Matplotlib dates.</p>
<p>The dates start at <em>dstart</em> and reach up to, but not including <em>dend</em>.
They are spaced by <em>delta</em>.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><dl class="first docutils">
<dt><strong>dstart, dend</strong> <span class="classifier-delimiter">:</span> <span class="classifier"><a class="reference external" href="https://docs.python.org/3/library/datetime.html#datetime.datetime" title="(in Python v3.7)"><code class="xref py py-obj docutils literal notranslate"><span class="pre">datetime</span></code></a></span></dt>
<dd><p class="first last">The date limits.</p>
</dd>
<dt><strong>delta</strong> <span class="classifier-delimiter">:</span> <span class="classifier"><a class="reference external" href="https://docs.python.org/3/library/datetime.html#datetime.timedelta" title="(in Python v3.7)"><code class="xref py py-obj docutils literal notranslate"><span class="pre">datetime.timedelta</span></code></a></span></dt>
<dd><p class="first last">Spacing of the dates.</p>
</dd>
</dl>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><dl class="first last docutils">
<dt><strong>drange</strong> <span class="classifier-delimiter">:</span> <span class="classifier"><a class="reference external" href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.array.html#numpy.array" title="(in NumPy v1.16)"><code class="xref py py-obj docutils literal notranslate"><span class="pre">numpy.array</span></code></a></span></dt>
<dd><p class="first last">A list floats representing Matplotlib dates.</p>
</dd>
</dl>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="function">
<dt id="matplotlib.dates.epoch2num">
<code class="descclassname">matplotlib.dates.</code><code class="descname">epoch2num</code><span class="sig-paren">(</span><em>e</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#epoch2num"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.epoch2num" title="Permalink to this definition">¶</a></dt>
<dd><p>Convert an epoch or sequence of epochs to the new date format,
that is days since 0001.</p>
</dd></dl>
<dl class="function">
<dt id="matplotlib.dates.num2epoch">
<code class="descclassname">matplotlib.dates.</code><code class="descname">num2epoch</code><span class="sig-paren">(</span><em>d</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#num2epoch"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.num2epoch" title="Permalink to this definition">¶</a></dt>
<dd><p>Convert days since 0001 to epoch. <em>d</em> can be a number or sequence.</p>
</dd></dl>
<dl class="function">
<dt id="matplotlib.dates.mx2num">
<code class="descclassname">matplotlib.dates.</code><code class="descname">mx2num</code><span class="sig-paren">(</span><em>mxdates</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#mx2num"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.mx2num" title="Permalink to this definition">¶</a></dt>
<dd><p>Convert mx <code class="xref py py-class docutils literal notranslate"><span class="pre">datetime</span></code> instance (or sequence of mx
instances) to the new date format.</p>
</dd></dl>
<dl class="class">
<dt id="matplotlib.dates.DateFormatter">
<em class="property">class </em><code class="descclassname">matplotlib.dates.</code><code class="descname">DateFormatter</code><span class="sig-paren">(</span><em>fmt</em>, <em>tz=None</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#DateFormatter"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.DateFormatter" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <a class="reference internal" href="ticker_api.html#matplotlib.ticker.Formatter" title="matplotlib.ticker.Formatter"><code class="xref py py-class docutils literal notranslate"><span class="pre">matplotlib.ticker.Formatter</span></code></a></p>
<p>Tick location is seconds since the epoch. Use a <a class="reference internal" href="#matplotlib.dates.DateFormatter.strftime" title="matplotlib.dates.DateFormatter.strftime"><code class="xref py py-func docutils literal notranslate"><span class="pre">strftime()</span></code></a>
format string.</p>
<p>Python only supports <a class="reference external" href="https://docs.python.org/3/library/datetime.html#module-datetime" title="(in Python v3.7)"><code class="xref py py-mod docutils literal notranslate"><span class="pre">datetime</span></code></a> <a class="reference internal" href="#matplotlib.dates.DateFormatter.strftime" title="matplotlib.dates.DateFormatter.strftime"><code class="xref py py-func docutils literal notranslate"><span class="pre">strftime()</span></code></a> formatting
for years greater than 1900. Thanks to Andrew Dalke, Dalke
Scientific Software who contributed the <a class="reference internal" href="#matplotlib.dates.DateFormatter.strftime" title="matplotlib.dates.DateFormatter.strftime"><code class="xref py py-func docutils literal notranslate"><span class="pre">strftime()</span></code></a> code
below to include dates earlier than this year.</p>
<dl class="docutils">
<dt><em>fmt</em> is a <a class="reference internal" href="#matplotlib.dates.DateFormatter.strftime" title="matplotlib.dates.DateFormatter.strftime"><code class="xref py py-func docutils literal notranslate"><span class="pre">strftime()</span></code></a> format string; <em>tz</em> is the</dt>
<dd><code class="xref py py-class docutils literal notranslate"><span class="pre">tzinfo</span></code> instance.</dd>
</dl>
<dl class="attribute">
<dt id="matplotlib.dates.DateFormatter.illegal_s">
<code class="descname">illegal_s</code><em class="property"> = re.compile('((^|[^%])(%%)*%s)')</em><a class="headerlink" href="#matplotlib.dates.DateFormatter.illegal_s" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
<dl class="method">
<dt id="matplotlib.dates.DateFormatter.set_tzinfo">
<code class="descname">set_tzinfo</code><span class="sig-paren">(</span><em>self</em>, <em>tz</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#DateFormatter.set_tzinfo"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.DateFormatter.set_tzinfo" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
<dl class="method">
<dt id="matplotlib.dates.DateFormatter.strftime">
<code class="descname">strftime</code><span class="sig-paren">(</span><em>self</em>, <em>dt</em>, <em>fmt=None</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#DateFormatter.strftime"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.DateFormatter.strftime" title="Permalink to this definition">¶</a></dt>
<dd><p>[<em>Deprecated</em>] Refer to documentation for <a class="reference external" href="https://docs.python.org/3/library/datetime.html#datetime.datetime.strftime" title="(in Python v3.7)"><code class="xref py py-meth docutils literal notranslate"><span class="pre">datetime.datetime.strftime()</span></code></a></p>
<p><em>fmt</em> is a <a class="reference external" href="https://docs.python.org/3/library/datetime.html#datetime.datetime.strftime" title="(in Python v3.7)"><code class="xref py py-meth docutils literal notranslate"><span class="pre">datetime.datetime.strftime()</span></code></a> format string.</p>
<p>Warning: For years before 1900, depending upon the current
locale it is possible that the year displayed with %x might
be incorrect. For years before 100, %y and %Y will yield
zero-padded strings.</p>
<p class="rubric">Notes</p>
<div class="deprecated">
<p><span class="versionmodified">Deprecated since version 3.0.</span></p>
</div>
</dd></dl>
<dl class="method">
<dt id="matplotlib.dates.DateFormatter.strftime_pre_1900">
<code class="descname">strftime_pre_1900</code><span class="sig-paren">(</span><em>self</em>, <em>dt</em>, <em>fmt=None</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#DateFormatter.strftime_pre_1900"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.DateFormatter.strftime_pre_1900" title="Permalink to this definition">¶</a></dt>
<dd><p>[<em>Deprecated</em>] Call time.strftime for years before 1900 by rolling
forward a multiple of 28 years.</p>
<p><em>fmt</em> is a <a class="reference internal" href="#matplotlib.dates.DateFormatter.strftime" title="matplotlib.dates.DateFormatter.strftime"><code class="xref py py-func docutils literal notranslate"><span class="pre">strftime()</span></code></a> format string.</p>
<p>Dalke: I hope I did this math right. Every 28 years the
calendar repeats, except through century leap years excepting
the 400 year leap years. But only if you're using the Gregorian
calendar.</p>
<p class="rubric">Notes</p>
<div class="deprecated">
<p><span class="versionmodified">Deprecated since version 3.0.</span></p>
</div>
</dd></dl>
</dd></dl>
<dl class="class">
<dt id="matplotlib.dates.ConciseDateFormatter">
<em class="property">class </em><code class="descclassname">matplotlib.dates.</code><code class="descname">ConciseDateFormatter</code><span class="sig-paren">(</span><em>locator</em>, <em>tz=None</em>, <em>formats=None</em>, <em>offset_formats=None</em>, <em>zero_formats=None</em>, <em>show_offset=True</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#ConciseDateFormatter"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.ConciseDateFormatter" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <a class="reference internal" href="ticker_api.html#matplotlib.ticker.Formatter" title="matplotlib.ticker.Formatter"><code class="xref py py-class docutils literal notranslate"><span class="pre">matplotlib.ticker.Formatter</span></code></a></p>
<p>This class attempts to figure out the best format to use for the
date, and to make it as compact as possible, but still be complete. This is
most useful when used with the <a class="reference internal" href="#matplotlib.dates.AutoDateLocator" title="matplotlib.dates.AutoDateLocator"><code class="xref py py-class docutils literal notranslate"><span class="pre">AutoDateLocator</span></code></a>:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="n">locator</span> <span class="o">=</span> <span class="n">AutoDateLocator</span><span class="p">()</span>
<span class="gp">>>> </span><span class="n">formatter</span> <span class="o">=</span> <span class="n">ConciseDateFormatter</span><span class="p">(</span><span class="n">locator</span><span class="p">)</span>
</pre></div>
</div>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><dl class="first last docutils">
<dt><strong>locator</strong> <span class="classifier-delimiter">:</span> <span class="classifier"><a class="reference internal" href="ticker_api.html#matplotlib.ticker.Locator" title="matplotlib.ticker.Locator"><code class="xref py py-obj docutils literal notranslate"><span class="pre">ticker.Locator</span></code></a></span></dt>
<dd><p class="first last">Locator that this axis is using.</p>
</dd>
<dt><strong>tz</strong> <span class="classifier-delimiter">:</span> <span class="classifier">string, optional</span></dt>
<dd><p class="first last">Passed to <a class="reference internal" href="#matplotlib.dates.date2num" title="matplotlib.dates.date2num"><code class="xref py py-obj docutils literal notranslate"><span class="pre">dates.date2num</span></code></a>.</p>
</dd>
<dt><strong>formats</strong> <span class="classifier-delimiter">:</span> <span class="classifier">list of 6 strings, optional</span></dt>
<dd><p class="first last">Format strings for 6 levels of tick labelling: mostly years,
months, days, hours, minutes, and seconds. Strings use
the same format codes as <code class="xref py py-obj docutils literal notranslate"><span class="pre">strftime</span></code>. Default is
<code class="docutils literal notranslate"><span class="pre">['%Y',</span> <span class="pre">'%b',</span> <span class="pre">'%d',</span> <span class="pre">'%H:%M',</span> <span class="pre">'%H:%M',</span> <span class="pre">'%S.%f']</span></code></p>
</dd>
<dt><strong>zero_formats</strong> <span class="classifier-delimiter">:</span> <span class="classifier">list of 6 strings, optional</span></dt>
<dd><p class="first last">Format strings for tick labels that are "zeros" for a given tick
level. For instance, if most ticks are months, ticks around 1 Jan 2005
will be labeled "Dec", "2005", "Feb". The default is
<code class="docutils literal notranslate"><span class="pre">['',</span> <span class="pre">'%Y',</span> <span class="pre">'%b',</span> <span class="pre">'%b-%d',</span> <span class="pre">'%H:%M',</span> <span class="pre">'%H:%M']</span></code></p>
</dd>
<dt><strong>offset_formats</strong> <span class="classifier-delimiter">:</span> <span class="classifier">list of 6 strings, optional</span></dt>
<dd><p class="first">Format strings for the 6 levels that is applied to the "offset"
string found on the right side of an x-axis, or top of a y-axis.
Combined with the tick labels this should completely specify the
date. The default is:</p>
<div class="last highlight-default notranslate"><div class="highlight"><pre><span></span><span class="p">[</span><span class="s1">''</span><span class="p">,</span> <span class="s1">'%Y'</span><span class="p">,</span> <span class="s1">'%Y-%b'</span><span class="p">,</span> <span class="s1">'%Y-%b-</span><span class="si">%d</span><span class="s1">'</span><span class="p">,</span> <span class="s1">'%Y-%b-</span><span class="si">%d</span><span class="s1">'</span><span class="p">,</span> <span class="s1">'%Y-%b-</span><span class="si">%d</span><span class="s1"> %H:%M'</span><span class="p">]</span>
</pre></div>
</div>
</dd>
<dt><strong>show_offset</strong> <span class="classifier-delimiter">:</span> <span class="classifier">bool</span></dt>
<dd><p class="first last">Whether to show the offset or not. Default is <code class="docutils literal notranslate"><span class="pre">True</span></code>.</p>
</dd>
</dl>
</td>
</tr>
</tbody>
</table>
<p class="rubric">Examples</p>
<p>See <a class="reference internal" href="../gallery/ticks_and_spines/date_concise_formatter.html"><span class="doc">Formatting date ticks using ConciseDateFormatter</span></a></p>
<p>(<a class="reference external" href="../api/dates_api-1.py">Source code</a>, <a class="reference external" href="../api/dates_api-1.png">png</a>, <a class="reference external" href="../api/dates_api-1.pdf">pdf</a>)</p>
<div class="figure">
<img alt="../_images/dates_api-1.png" src="../_images/dates_api-1.png" />
</div>
<p>Autoformat the date labels. The default format is used to form an
initial string, and then redundant elements are removed.</p>
<dl class="method">
<dt id="matplotlib.dates.ConciseDateFormatter.format_data_short">
<code class="descname">format_data_short</code><span class="sig-paren">(</span><em>self</em>, <em>value</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#ConciseDateFormatter.format_data_short"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.ConciseDateFormatter.format_data_short" title="Permalink to this definition">¶</a></dt>
<dd><p>Return a short string version of the tick value.</p>
<p>Defaults to the position-independent long value.</p>
</dd></dl>
<dl class="method">
<dt id="matplotlib.dates.ConciseDateFormatter.format_ticks">
<code class="descname">format_ticks</code><span class="sig-paren">(</span><em>self</em>, <em>values</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#ConciseDateFormatter.format_ticks"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.ConciseDateFormatter.format_ticks" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the tick labels for all the ticks at once.</p>
</dd></dl>
<dl class="method">
<dt id="matplotlib.dates.ConciseDateFormatter.get_offset">
<code class="descname">get_offset</code><span class="sig-paren">(</span><em>self</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#ConciseDateFormatter.get_offset"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.ConciseDateFormatter.get_offset" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
</dd></dl>
<dl class="class">
<dt id="matplotlib.dates.IndexDateFormatter">
<em class="property">class </em><code class="descclassname">matplotlib.dates.</code><code class="descname">IndexDateFormatter</code><span class="sig-paren">(</span><em>t</em>, <em>fmt</em>, <em>tz=None</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#IndexDateFormatter"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.IndexDateFormatter" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <a class="reference internal" href="ticker_api.html#matplotlib.ticker.Formatter" title="matplotlib.ticker.Formatter"><code class="xref py py-class docutils literal notranslate"><span class="pre">matplotlib.ticker.Formatter</span></code></a></p>
<p>Use with <a class="reference internal" href="ticker_api.html#matplotlib.ticker.IndexLocator" title="matplotlib.ticker.IndexLocator"><code class="xref py py-class docutils literal notranslate"><span class="pre">IndexLocator</span></code></a> to cycle format
strings by index.</p>
<p><em>t</em> is a sequence of dates (floating point days). <em>fmt</em> is a
<code class="xref py py-func docutils literal notranslate"><span class="pre">strftime()</span></code> format string.</p>
</dd></dl>
<dl class="class">
<dt id="matplotlib.dates.AutoDateFormatter">
<em class="property">class </em><code class="descclassname">matplotlib.dates.</code><code class="descname">AutoDateFormatter</code><span class="sig-paren">(</span><em>locator</em>, <em>tz=None</em>, <em>defaultfmt='%Y-%m-%d'</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#AutoDateFormatter"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.AutoDateFormatter" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <a class="reference internal" href="ticker_api.html#matplotlib.ticker.Formatter" title="matplotlib.ticker.Formatter"><code class="xref py py-class docutils literal notranslate"><span class="pre">matplotlib.ticker.Formatter</span></code></a></p>
<p>This class attempts to figure out the best format to use. This is
most useful when used with the <a class="reference internal" href="#matplotlib.dates.AutoDateLocator" title="matplotlib.dates.AutoDateLocator"><code class="xref py py-class docutils literal notranslate"><span class="pre">AutoDateLocator</span></code></a>.</p>
<p>The AutoDateFormatter has a scale dictionary that maps the scale
of the tick (the distance in days between one major tick) and a
format string. The default looks like this:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="bp">self</span><span class="o">.</span><span class="n">scaled</span> <span class="o">=</span> <span class="p">{</span>
<span class="n">DAYS_PER_YEAR</span><span class="p">:</span> <span class="n">rcParams</span><span class="p">[</span><span class="s1">'date.autoformat.year'</span><span class="p">],</span>
<span class="n">DAYS_PER_MONTH</span><span class="p">:</span> <span class="n">rcParams</span><span class="p">[</span><span class="s1">'date.autoformat.month'</span><span class="p">],</span>
<span class="mf">1.0</span><span class="p">:</span> <span class="n">rcParams</span><span class="p">[</span><span class="s1">'date.autoformat.day'</span><span class="p">],</span>
<span class="mf">1.</span> <span class="o">/</span> <span class="n">HOURS_PER_DAY</span><span class="p">:</span> <span class="n">rcParams</span><span class="p">[</span><span class="s1">'date.autoformat.hour'</span><span class="p">],</span>
<span class="mf">1.</span> <span class="o">/</span> <span class="p">(</span><span class="n">MINUTES_PER_DAY</span><span class="p">):</span> <span class="n">rcParams</span><span class="p">[</span><span class="s1">'date.autoformat.minute'</span><span class="p">],</span>
<span class="mf">1.</span> <span class="o">/</span> <span class="p">(</span><span class="n">SEC_PER_DAY</span><span class="p">):</span> <span class="n">rcParams</span><span class="p">[</span><span class="s1">'date.autoformat.second'</span><span class="p">],</span>
<span class="mf">1.</span> <span class="o">/</span> <span class="p">(</span><span class="n">MUSECONDS_PER_DAY</span><span class="p">):</span> <span class="n">rcParams</span><span class="p">[</span><span class="s1">'date.autoformat.microsecond'</span><span class="p">],</span>
<span class="p">}</span>
</pre></div>
</div>
<p>The algorithm picks the key in the dictionary that is >= the
current scale and uses that format string. You can customize this
dictionary by doing:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="n">locator</span> <span class="o">=</span> <span class="n">AutoDateLocator</span><span class="p">()</span>
<span class="gp">>>> </span><span class="n">formatter</span> <span class="o">=</span> <span class="n">AutoDateFormatter</span><span class="p">(</span><span class="n">locator</span><span class="p">)</span>
<span class="gp">>>> </span><span class="n">formatter</span><span class="o">.</span><span class="n">scaled</span><span class="p">[</span><span class="mi">1</span><span class="o">/</span><span class="p">(</span><span class="mf">24.</span><span class="o">*</span><span class="mf">60.</span><span class="p">)]</span> <span class="o">=</span> <span class="s1">'%M:%S'</span> <span class="c1"># only show min and sec</span>
</pre></div>
</div>
<p>A custom <a class="reference internal" href="ticker_api.html#matplotlib.ticker.FuncFormatter" title="matplotlib.ticker.FuncFormatter"><code class="xref py py-class docutils literal notranslate"><span class="pre">FuncFormatter</span></code></a> can also be used.
The following example shows how to use a custom format function to strip
trailing zeros from decimal seconds and adds the date to the first
ticklabel:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="k">def</span> <span class="nf">my_format_function</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">pos</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="gp">... </span> <span class="n">x</span> <span class="o">=</span> <span class="n">matplotlib</span><span class="o">.</span><span class="n">dates</span><span class="o">.</span><span class="n">num2date</span><span class="p">(</span><span class="n">x</span><span class="p">)</span>
<span class="gp">... </span> <span class="k">if</span> <span class="n">pos</span> <span class="o">==</span> <span class="mi">0</span><span class="p">:</span>
<span class="gp">... </span> <span class="n">fmt</span> <span class="o">=</span> <span class="s1">'%D %H:%M:%S.</span><span class="si">%f</span><span class="s1">'</span>
<span class="gp">... </span> <span class="k">else</span><span class="p">:</span>
<span class="gp">... </span> <span class="n">fmt</span> <span class="o">=</span> <span class="s1">'%H:%M:%S.</span><span class="si">%f</span><span class="s1">'</span>
<span class="gp">... </span> <span class="n">label</span> <span class="o">=</span> <span class="n">x</span><span class="o">.</span><span class="n">strftime</span><span class="p">(</span><span class="n">fmt</span><span class="p">)</span>
<span class="gp">... </span> <span class="n">label</span> <span class="o">=</span> <span class="n">label</span><span class="o">.</span><span class="n">rstrip</span><span class="p">(</span><span class="s2">"0"</span><span class="p">)</span>
<span class="gp">... </span> <span class="n">label</span> <span class="o">=</span> <span class="n">label</span><span class="o">.</span><span class="n">rstrip</span><span class="p">(</span><span class="s2">"."</span><span class="p">)</span>
<span class="gp">... </span> <span class="k">return</span> <span class="n">label</span>
<span class="gp">>>> </span><span class="kn">from</span> <span class="nn">matplotlib.ticker</span> <span class="k">import</span> <span class="n">FuncFormatter</span>
<span class="gp">>>> </span><span class="n">formatter</span><span class="o">.</span><span class="n">scaled</span><span class="p">[</span><span class="mi">1</span><span class="o">/</span><span class="p">(</span><span class="mf">24.</span><span class="o">*</span><span class="mf">60.</span><span class="p">)]</span> <span class="o">=</span> <span class="n">FuncFormatter</span><span class="p">(</span><span class="n">my_format_function</span><span class="p">)</span>
</pre></div>
</div>
<p>Autoformat the date labels. The default format is the one to use
if none of the values in <code class="docutils literal notranslate"><span class="pre">self.scaled</span></code> are greater than the unit
returned by <code class="docutils literal notranslate"><span class="pre">locator._get_unit()</span></code>.</p>
</dd></dl>
<dl class="class">
<dt id="matplotlib.dates.DateLocator">
<em class="property">class </em><code class="descclassname">matplotlib.dates.</code><code class="descname">DateLocator</code><span class="sig-paren">(</span><em>tz=None</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#DateLocator"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.DateLocator" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <a class="reference internal" href="ticker_api.html#matplotlib.ticker.Locator" title="matplotlib.ticker.Locator"><code class="xref py py-class docutils literal notranslate"><span class="pre">matplotlib.ticker.Locator</span></code></a></p>
<p>Determines the tick locations when plotting dates.</p>
<p>This class is subclassed by other Locators and
is not meant to be used on its own.</p>
<p><em>tz</em> is a <code class="xref py py-class docutils literal notranslate"><span class="pre">tzinfo</span></code> instance.</p>
<dl class="method">
<dt id="matplotlib.dates.DateLocator.datalim_to_dt">
<code class="descname">datalim_to_dt</code><span class="sig-paren">(</span><em>self</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#DateLocator.datalim_to_dt"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.DateLocator.datalim_to_dt" title="Permalink to this definition">¶</a></dt>
<dd><p>Convert axis data interval to datetime objects.</p>
</dd></dl>
<dl class="attribute">
<dt id="matplotlib.dates.DateLocator.hms0d">
<code class="descname">hms0d</code><em class="property"> = {'byhour': 0, 'byminute': 0, 'bysecond': 0}</em><a class="headerlink" href="#matplotlib.dates.DateLocator.hms0d" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
<dl class="method">
<dt id="matplotlib.dates.DateLocator.nonsingular">
<code class="descname">nonsingular</code><span class="sig-paren">(</span><em>self</em>, <em>vmin</em>, <em>vmax</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#DateLocator.nonsingular"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.DateLocator.nonsingular" title="Permalink to this definition">¶</a></dt>
<dd><p>Given the proposed upper and lower extent, adjust the range
if it is too close to being singular (i.e. a range of ~0).</p>
</dd></dl>
<dl class="method">
<dt id="matplotlib.dates.DateLocator.set_tzinfo">
<code class="descname">set_tzinfo</code><span class="sig-paren">(</span><em>self</em>, <em>tz</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#DateLocator.set_tzinfo"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.DateLocator.set_tzinfo" title="Permalink to this definition">¶</a></dt>
<dd><p>Set time zone info.</p>
</dd></dl>
<dl class="method">
<dt id="matplotlib.dates.DateLocator.viewlim_to_dt">
<code class="descname">viewlim_to_dt</code><span class="sig-paren">(</span><em>self</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#DateLocator.viewlim_to_dt"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.DateLocator.viewlim_to_dt" title="Permalink to this definition">¶</a></dt>
<dd><p>Converts the view interval to datetime objects.</p>
</dd></dl>
</dd></dl>
<dl class="class">
<dt id="matplotlib.dates.RRuleLocator">
<em class="property">class </em><code class="descclassname">matplotlib.dates.</code><code class="descname">RRuleLocator</code><span class="sig-paren">(</span><em>o</em>, <em>tz=None</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#RRuleLocator"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.RRuleLocator" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <a class="reference internal" href="#matplotlib.dates.DateLocator" title="matplotlib.dates.DateLocator"><code class="xref py py-class docutils literal notranslate"><span class="pre">matplotlib.dates.DateLocator</span></code></a></p>
<dl class="method">
<dt id="matplotlib.dates.RRuleLocator.autoscale">
<code class="descname">autoscale</code><span class="sig-paren">(</span><em>self</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#RRuleLocator.autoscale"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.RRuleLocator.autoscale" title="Permalink to this definition">¶</a></dt>
<dd><p>Set the view limits to include the data range.</p>
</dd></dl>
<dl class="staticmethod">
<dt id="matplotlib.dates.RRuleLocator.get_unit_generic">
<em class="property">static </em><code class="descname">get_unit_generic</code><span class="sig-paren">(</span><em>freq</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#RRuleLocator.get_unit_generic"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.RRuleLocator.get_unit_generic" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
<dl class="method">
<dt id="matplotlib.dates.RRuleLocator.tick_values">
<code class="descname">tick_values</code><span class="sig-paren">(</span><em>self</em>, <em>vmin</em>, <em>vmax</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#RRuleLocator.tick_values"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.RRuleLocator.tick_values" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the values of the located ticks given <strong>vmin</strong> and <strong>vmax</strong>.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p>To get tick locations with the vmin and vmax values defined
automatically for the associated <code class="xref py py-attr docutils literal notranslate"><span class="pre">axis</span></code> simply call
the Locator instance:</p>
<div class="last highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="nb">print</span><span class="p">(</span><span class="nb">type</span><span class="p">(</span><span class="n">loc</span><span class="p">))</span>
<span class="go"><type 'Locator'></span>
<span class="gp">>>> </span><span class="nb">print</span><span class="p">(</span><span class="n">loc</span><span class="p">())</span>
<span class="go">[1, 2, 3, 4]</span>
</pre></div>
</div>
</div>
</dd></dl>
</dd></dl>
<dl class="class">
<dt id="matplotlib.dates.AutoDateLocator">
<em class="property">class </em><code class="descclassname">matplotlib.dates.</code><code class="descname">AutoDateLocator</code><span class="sig-paren">(</span><em>tz=None</em>, <em>minticks=5</em>, <em>maxticks=None</em>, <em>interval_multiples=True</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#AutoDateLocator"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.AutoDateLocator" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <a class="reference internal" href="#matplotlib.dates.DateLocator" title="matplotlib.dates.DateLocator"><code class="xref py py-class docutils literal notranslate"><span class="pre">matplotlib.dates.DateLocator</span></code></a></p>
<p>On autoscale, this class picks the best
<a class="reference internal" href="#matplotlib.dates.DateLocator" title="matplotlib.dates.DateLocator"><code class="xref py py-class docutils literal notranslate"><span class="pre">DateLocator</span></code></a> to set the view limits and the tick
locations.</p>
<p><em>minticks</em> is the minimum number of ticks desired, which is used to
select the type of ticking (yearly, monthly, etc.).</p>
<p><em>maxticks</em> is the maximum number of ticks desired, which controls
any interval between ticks (ticking every other, every 3, etc.).
For really fine-grained control, this can be a dictionary mapping
individual rrule frequency constants (YEARLY, MONTHLY, etc.)
to their own maximum number of ticks. This can be used to keep
the number of ticks appropriate to the format chosen in
<a class="reference internal" href="#matplotlib.dates.AutoDateFormatter" title="matplotlib.dates.AutoDateFormatter"><code class="xref py py-class docutils literal notranslate"><span class="pre">AutoDateFormatter</span></code></a>. Any frequency not specified in this
dictionary is given a default value.</p>
<p><em>tz</em> is a <code class="xref py py-class docutils literal notranslate"><span class="pre">tzinfo</span></code> instance.</p>
<p><em>interval_multiples</em> is a boolean that indicates whether ticks
should be chosen to be multiple of the interval. This will lock
ticks to 'nicer' locations. For example, this will force the
ticks to be at hours 0,6,12,18 when hourly ticking is done at
6 hour intervals.</p>
<p>The AutoDateLocator has an interval dictionary that maps the
frequency of the tick (a constant from dateutil.rrule) and a
multiple allowed for that ticking. The default looks like this:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="bp">self</span><span class="o">.</span><span class="n">intervald</span> <span class="o">=</span> <span class="p">{</span>
<span class="n">YEARLY</span> <span class="p">:</span> <span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">4</span><span class="p">,</span> <span class="mi">5</span><span class="p">,</span> <span class="mi">10</span><span class="p">,</span> <span class="mi">20</span><span class="p">,</span> <span class="mi">40</span><span class="p">,</span> <span class="mi">50</span><span class="p">,</span> <span class="mi">100</span><span class="p">,</span> <span class="mi">200</span><span class="p">,</span> <span class="mi">400</span><span class="p">,</span> <span class="mi">500</span><span class="p">,</span>
<span class="mi">1000</span><span class="p">,</span> <span class="mi">2000</span><span class="p">,</span> <span class="mi">4000</span><span class="p">,</span> <span class="mi">5000</span><span class="p">,</span> <span class="mi">10000</span><span class="p">],</span>
<span class="n">MONTHLY</span> <span class="p">:</span> <span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">4</span><span class="p">,</span> <span class="mi">6</span><span class="p">],</span>
<span class="n">DAILY</span> <span class="p">:</span> <span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">7</span><span class="p">,</span> <span class="mi">14</span><span class="p">],</span>
<span class="n">HOURLY</span> <span class="p">:</span> <span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">4</span><span class="p">,</span> <span class="mi">6</span><span class="p">,</span> <span class="mi">12</span><span class="p">],</span>
<span class="n">MINUTELY</span><span class="p">:</span> <span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">5</span><span class="p">,</span> <span class="mi">10</span><span class="p">,</span> <span class="mi">15</span><span class="p">,</span> <span class="mi">30</span><span class="p">],</span>
<span class="n">SECONDLY</span><span class="p">:</span> <span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">5</span><span class="p">,</span> <span class="mi">10</span><span class="p">,</span> <span class="mi">15</span><span class="p">,</span> <span class="mi">30</span><span class="p">],</span>
<span class="n">MICROSECONDLY</span><span class="p">:</span> <span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">5</span><span class="p">,</span> <span class="mi">10</span><span class="p">,</span> <span class="mi">20</span><span class="p">,</span> <span class="mi">50</span><span class="p">,</span> <span class="mi">100</span><span class="p">,</span> <span class="mi">200</span><span class="p">,</span> <span class="mi">500</span><span class="p">,</span> <span class="mi">1000</span><span class="p">,</span> <span class="mi">2000</span><span class="p">,</span>
<span class="mi">5000</span><span class="p">,</span> <span class="mi">10000</span><span class="p">,</span> <span class="mi">20000</span><span class="p">,</span> <span class="mi">50000</span><span class="p">,</span> <span class="mi">100000</span><span class="p">,</span> <span class="mi">200000</span><span class="p">,</span> <span class="mi">500000</span><span class="p">,</span>
<span class="mi">1000000</span><span class="p">],</span>
<span class="p">}</span>
</pre></div>
</div>
<p>The interval is used to specify multiples that are appropriate for
the frequency of ticking. For instance, every 7 days is sensible
for daily ticks, but for minutes/seconds, 15 or 30 make sense.
You can customize this dictionary by doing:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">locator</span> <span class="o">=</span> <span class="n">AutoDateLocator</span><span class="p">()</span>
<span class="n">locator</span><span class="o">.</span><span class="n">intervald</span><span class="p">[</span><span class="n">HOURLY</span><span class="p">]</span> <span class="o">=</span> <span class="p">[</span><span class="mi">3</span><span class="p">]</span> <span class="c1"># only show every 3 hours</span>
</pre></div>
</div>
<dl class="method">
<dt id="matplotlib.dates.AutoDateLocator.autoscale">
<code class="descname">autoscale</code><span class="sig-paren">(</span><em>self</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#AutoDateLocator.autoscale"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.AutoDateLocator.autoscale" title="Permalink to this definition">¶</a></dt>
<dd><p>Try to choose the view limits intelligently.</p>
</dd></dl>
<dl class="method">
<dt id="matplotlib.dates.AutoDateLocator.get_locator">
<code class="descname">get_locator</code><span class="sig-paren">(</span><em>self</em>, <em>dmin</em>, <em>dmax</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#AutoDateLocator.get_locator"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.AutoDateLocator.get_locator" title="Permalink to this definition">¶</a></dt>
<dd><p>Pick the best locator based on a distance.</p>
</dd></dl>
<dl class="method">
<dt id="matplotlib.dates.AutoDateLocator.nonsingular">
<code class="descname">nonsingular</code><span class="sig-paren">(</span><em>self</em>, <em>vmin</em>, <em>vmax</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#AutoDateLocator.nonsingular"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.AutoDateLocator.nonsingular" title="Permalink to this definition">¶</a></dt>
<dd><p>Given the proposed upper and lower extent, adjust the range
if it is too close to being singular (i.e. a range of ~0).</p>
</dd></dl>
<dl class="method">
<dt id="matplotlib.dates.AutoDateLocator.refresh">
<code class="descname">refresh</code><span class="sig-paren">(</span><em>self</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#AutoDateLocator.refresh"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.AutoDateLocator.refresh" title="Permalink to this definition">¶</a></dt>
<dd><p>Refresh internal information based on current limits.</p>
</dd></dl>
<dl class="method">
<dt id="matplotlib.dates.AutoDateLocator.set_axis">
<code class="descname">set_axis</code><span class="sig-paren">(</span><em>self</em>, <em>axis</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#AutoDateLocator.set_axis"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.AutoDateLocator.set_axis" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
<dl class="method">
<dt id="matplotlib.dates.AutoDateLocator.tick_values">
<code class="descname">tick_values</code><span class="sig-paren">(</span><em>self</em>, <em>vmin</em>, <em>vmax</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#AutoDateLocator.tick_values"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.AutoDateLocator.tick_values" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the values of the located ticks given <strong>vmin</strong> and <strong>vmax</strong>.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p>To get tick locations with the vmin and vmax values defined
automatically for the associated <code class="xref py py-attr docutils literal notranslate"><span class="pre">axis</span></code> simply call
the Locator instance:</p>
<div class="last highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="nb">print</span><span class="p">(</span><span class="nb">type</span><span class="p">(</span><span class="n">loc</span><span class="p">))</span>
<span class="go"><type 'Locator'></span>
<span class="gp">>>> </span><span class="nb">print</span><span class="p">(</span><span class="n">loc</span><span class="p">())</span>
<span class="go">[1, 2, 3, 4]</span>
</pre></div>
</div>
</div>
</dd></dl>
</dd></dl>
<dl class="class">
<dt id="matplotlib.dates.YearLocator">
<em class="property">class </em><code class="descclassname">matplotlib.dates.</code><code class="descname">YearLocator</code><span class="sig-paren">(</span><em>base=1</em>, <em>month=1</em>, <em>day=1</em>, <em>tz=None</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#YearLocator"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.YearLocator" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <a class="reference internal" href="#matplotlib.dates.DateLocator" title="matplotlib.dates.DateLocator"><code class="xref py py-class docutils literal notranslate"><span class="pre">matplotlib.dates.DateLocator</span></code></a></p>
<p>Make ticks on a given day of each year that is a multiple of base.</p>
<p>Examples:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="c1"># Tick every year on Jan 1st</span>
<span class="n">locator</span> <span class="o">=</span> <span class="n">YearLocator</span><span class="p">()</span>
<span class="c1"># Tick every 5 years on July 4th</span>
<span class="n">locator</span> <span class="o">=</span> <span class="n">YearLocator</span><span class="p">(</span><span class="mi">5</span><span class="p">,</span> <span class="n">month</span><span class="o">=</span><span class="mi">7</span><span class="p">,</span> <span class="n">day</span><span class="o">=</span><span class="mi">4</span><span class="p">)</span>
</pre></div>
</div>
<p>Mark years that are multiple of base on a given month and day
(default jan 1).</p>
<dl class="method">
<dt id="matplotlib.dates.YearLocator.autoscale">
<code class="descname">autoscale</code><span class="sig-paren">(</span><em>self</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#YearLocator.autoscale"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.YearLocator.autoscale" title="Permalink to this definition">¶</a></dt>
<dd><p>Set the view limits to include the data range.</p>
</dd></dl>
<dl class="method">
<dt id="matplotlib.dates.YearLocator.tick_values">
<code class="descname">tick_values</code><span class="sig-paren">(</span><em>self</em>, <em>vmin</em>, <em>vmax</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#YearLocator.tick_values"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.YearLocator.tick_values" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the values of the located ticks given <strong>vmin</strong> and <strong>vmax</strong>.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p>To get tick locations with the vmin and vmax values defined
automatically for the associated <code class="xref py py-attr docutils literal notranslate"><span class="pre">axis</span></code> simply call
the Locator instance:</p>
<div class="last highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="nb">print</span><span class="p">(</span><span class="nb">type</span><span class="p">(</span><span class="n">loc</span><span class="p">))</span>
<span class="go"><type 'Locator'></span>
<span class="gp">>>> </span><span class="nb">print</span><span class="p">(</span><span class="n">loc</span><span class="p">())</span>
<span class="go">[1, 2, 3, 4]</span>
</pre></div>
</div>
</div>
</dd></dl>
</dd></dl>
<dl class="class">
<dt id="matplotlib.dates.MonthLocator">
<em class="property">class </em><code class="descclassname">matplotlib.dates.</code><code class="descname">MonthLocator</code><span class="sig-paren">(</span><em>bymonth=None</em>, <em>bymonthday=1</em>, <em>interval=1</em>, <em>tz=None</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#MonthLocator"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.MonthLocator" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <a class="reference internal" href="#matplotlib.dates.RRuleLocator" title="matplotlib.dates.RRuleLocator"><code class="xref py py-class docutils literal notranslate"><span class="pre">matplotlib.dates.RRuleLocator</span></code></a></p>
<p>Make ticks on occurrences of each month, e.g., 1, 3, 12.</p>
<p>Mark every month in <em>bymonth</em>; <em>bymonth</em> can be an int or
sequence. Default is <code class="docutils literal notranslate"><span class="pre">range(1,13)</span></code>, i.e. every month.</p>
<p><em>interval</em> is the interval between each iteration. For
example, if <code class="docutils literal notranslate"><span class="pre">interval=2</span></code>, mark every second occurrence.</p>
</dd></dl>
<dl class="class">
<dt id="matplotlib.dates.WeekdayLocator">
<em class="property">class </em><code class="descclassname">matplotlib.dates.</code><code class="descname">WeekdayLocator</code><span class="sig-paren">(</span><em>byweekday=1</em>, <em>interval=1</em>, <em>tz=None</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#WeekdayLocator"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.WeekdayLocator" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <a class="reference internal" href="#matplotlib.dates.RRuleLocator" title="matplotlib.dates.RRuleLocator"><code class="xref py py-class docutils literal notranslate"><span class="pre">matplotlib.dates.RRuleLocator</span></code></a></p>
<p>Make ticks on occurrences of each weekday.</p>
<p>Mark every weekday in <em>byweekday</em>; <em>byweekday</em> can be a number or
sequence.</p>
<p>Elements of <em>byweekday</em> must be one of MO, TU, WE, TH, FR, SA,
SU, the constants from <a class="reference external" href="https://dateutil.readthedocs.io/en/stable/rrule.html#module-dateutil.rrule" title="(in dateutil v2.8.0)"><code class="xref py py-mod docutils literal notranslate"><span class="pre">dateutil.rrule</span></code></a>, which have been
imported into the <a class="reference internal" href="#module-matplotlib.dates" title="matplotlib.dates"><code class="xref py py-mod docutils literal notranslate"><span class="pre">matplotlib.dates</span></code></a> namespace.</p>
<p><em>interval</em> specifies the number of weeks to skip. For example,
<code class="docutils literal notranslate"><span class="pre">interval=2</span></code> plots every second week.</p>
</dd></dl>
<dl class="class">
<dt id="matplotlib.dates.DayLocator">
<em class="property">class </em><code class="descclassname">matplotlib.dates.</code><code class="descname">DayLocator</code><span class="sig-paren">(</span><em>bymonthday=None</em>, <em>interval=1</em>, <em>tz=None</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#DayLocator"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.DayLocator" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <a class="reference internal" href="#matplotlib.dates.RRuleLocator" title="matplotlib.dates.RRuleLocator"><code class="xref py py-class docutils literal notranslate"><span class="pre">matplotlib.dates.RRuleLocator</span></code></a></p>
<p>Make ticks on occurrences of each day of the month. For example,
1, 15, 30.</p>
<p>Mark every day in <em>bymonthday</em>; <em>bymonthday</em> can be an int or
sequence.</p>
<p>Default is to tick every day of the month: <code class="docutils literal notranslate"><span class="pre">bymonthday=range(1,32)</span></code></p>
</dd></dl>
<dl class="class">
<dt id="matplotlib.dates.HourLocator">
<em class="property">class </em><code class="descclassname">matplotlib.dates.</code><code class="descname">HourLocator</code><span class="sig-paren">(</span><em>byhour=None</em>, <em>interval=1</em>, <em>tz=None</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#HourLocator"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.HourLocator" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <a class="reference internal" href="#matplotlib.dates.RRuleLocator" title="matplotlib.dates.RRuleLocator"><code class="xref py py-class docutils literal notranslate"><span class="pre">matplotlib.dates.RRuleLocator</span></code></a></p>
<p>Make ticks on occurrences of each hour.</p>
<p>Mark every hour in <em>byhour</em>; <em>byhour</em> can be an int or sequence.
Default is to tick every hour: <code class="docutils literal notranslate"><span class="pre">byhour=range(24)</span></code></p>
<p><em>interval</em> is the interval between each iteration. For
example, if <code class="docutils literal notranslate"><span class="pre">interval=2</span></code>, mark every second occurrence.</p>
</dd></dl>
<dl class="class">
<dt id="matplotlib.dates.MinuteLocator">
<em class="property">class </em><code class="descclassname">matplotlib.dates.</code><code class="descname">MinuteLocator</code><span class="sig-paren">(</span><em>byminute=None</em>, <em>interval=1</em>, <em>tz=None</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#MinuteLocator"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.MinuteLocator" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <a class="reference internal" href="#matplotlib.dates.RRuleLocator" title="matplotlib.dates.RRuleLocator"><code class="xref py py-class docutils literal notranslate"><span class="pre">matplotlib.dates.RRuleLocator</span></code></a></p>
<p>Make ticks on occurrences of each minute.</p>
<p>Mark every minute in <em>byminute</em>; <em>byminute</em> can be an int or
sequence. Default is to tick every minute: <code class="docutils literal notranslate"><span class="pre">byminute=range(60)</span></code></p>
<p><em>interval</em> is the interval between each iteration. For
example, if <code class="docutils literal notranslate"><span class="pre">interval=2</span></code>, mark every second occurrence.</p>
</dd></dl>
<dl class="class">
<dt id="matplotlib.dates.SecondLocator">
<em class="property">class </em><code class="descclassname">matplotlib.dates.</code><code class="descname">SecondLocator</code><span class="sig-paren">(</span><em>bysecond=None</em>, <em>interval=1</em>, <em>tz=None</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#SecondLocator"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.SecondLocator" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <a class="reference internal" href="#matplotlib.dates.RRuleLocator" title="matplotlib.dates.RRuleLocator"><code class="xref py py-class docutils literal notranslate"><span class="pre">matplotlib.dates.RRuleLocator</span></code></a></p>
<p>Make ticks on occurrences of each second.</p>
<p>Mark every second in <em>bysecond</em>; <em>bysecond</em> can be an int or
sequence. Default is to tick every second: <code class="docutils literal notranslate"><span class="pre">bysecond</span> <span class="pre">=</span> <span class="pre">range(60)</span></code></p>
<p><em>interval</em> is the interval between each iteration. For
example, if <code class="docutils literal notranslate"><span class="pre">interval=2</span></code>, mark every second occurrence.</p>
</dd></dl>
<dl class="class">
<dt id="matplotlib.dates.MicrosecondLocator">
<em class="property">class </em><code class="descclassname">matplotlib.dates.</code><code class="descname">MicrosecondLocator</code><span class="sig-paren">(</span><em>interval=1</em>, <em>tz=None</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#MicrosecondLocator"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.MicrosecondLocator" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <a class="reference internal" href="#matplotlib.dates.DateLocator" title="matplotlib.dates.DateLocator"><code class="xref py py-class docutils literal notranslate"><span class="pre">matplotlib.dates.DateLocator</span></code></a></p>
<p>Make ticks on regular intervals of one or more microsecond(s).</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p>Due to the floating point representation of time in days since
0001-01-01 UTC (plus 1), plotting data with microsecond time
resolution does not work well with current dates.</p>
<p>If you want microsecond resolution time plots, it is strongly
recommended to use floating point seconds, not datetime-like
time representation.</p>
<p class="last">If you really must use datetime.datetime() or similar and still
need microsecond precision, your only chance is to use very
early years; using year 0001 is recommended.</p>
</div>
<p><em>interval</em> is the interval between each iteration. For
example, if <code class="docutils literal notranslate"><span class="pre">interval=2</span></code>, mark every second microsecond.</p>
<dl class="method">
<dt id="matplotlib.dates.MicrosecondLocator.set_axis">
<code class="descname">set_axis</code><span class="sig-paren">(</span><em>self</em>, <em>axis</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#MicrosecondLocator.set_axis"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.MicrosecondLocator.set_axis" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
<dl class="method">
<dt id="matplotlib.dates.MicrosecondLocator.set_data_interval">
<code class="descname">set_data_interval</code><span class="sig-paren">(</span><em>self</em>, <em>vmin</em>, <em>vmax</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#MicrosecondLocator.set_data_interval"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.MicrosecondLocator.set_data_interval" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
<dl class="method">
<dt id="matplotlib.dates.MicrosecondLocator.set_view_interval">
<code class="descname">set_view_interval</code><span class="sig-paren">(</span><em>self</em>, <em>vmin</em>, <em>vmax</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#MicrosecondLocator.set_view_interval"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.MicrosecondLocator.set_view_interval" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
<dl class="method">
<dt id="matplotlib.dates.MicrosecondLocator.tick_values">
<code class="descname">tick_values</code><span class="sig-paren">(</span><em>self</em>, <em>vmin</em>, <em>vmax</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dates.html#MicrosecondLocator.tick_values"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.MicrosecondLocator.tick_values" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the values of the located ticks given <strong>vmin</strong> and <strong>vmax</strong>.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p>To get tick locations with the vmin and vmax values defined
automatically for the associated <code class="xref py py-attr docutils literal notranslate"><span class="pre">axis</span></code> simply call
the Locator instance:</p>
<div class="last highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="nb">print</span><span class="p">(</span><span class="nb">type</span><span class="p">(</span><span class="n">loc</span><span class="p">))</span>
<span class="go"><type 'Locator'></span>
<span class="gp">>>> </span><span class="nb">print</span><span class="p">(</span><span class="n">loc</span><span class="p">())</span>
<span class="go">[1, 2, 3, 4]</span>
</pre></div>
</div>
</div>
</dd></dl>
</dd></dl>
<dl class="class">
<dt id="matplotlib.dates.rrule">
<em class="property">class </em><code class="descclassname">matplotlib.dates.</code><code class="descname">rrule</code><span class="sig-paren">(</span><em>freq</em>, <em>dtstart=None</em>, <em>interval=1</em>, <em>wkst=None</em>, <em>count=None</em>, <em>until=None</em>, <em>bysetpos=None</em>, <em>bymonth=None</em>, <em>bymonthday=None</em>, <em>byyearday=None</em>, <em>byeaster=None</em>, <em>byweekno=None</em>, <em>byweekday=None</em>, <em>byhour=None</em>, <em>byminute=None</em>, <em>bysecond=None</em>, <em>cache=False</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/dateutil/rrule.html#rrule"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dates.rrule" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <code class="xref py py-class docutils literal notranslate"><span class="pre">dateutil.rrule.rrulebase</span></code></p>
<p>That's the base of the rrule operation. It accepts all the keywords
defined in the RFC as its constructor parameters (except byday,
You can’t perform that action at this time.