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<li><a class="reference internal" href="#matplotlib-date-format">Matplotlib date format</a></li>
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<div class="section" id="dates">
<h1>dates<a class="headerlink" href="#dates" title="Permalink to this headline">¶</a></h1>
<img src="../_images/inheritance-36ae735e98a0b6edf8f91ba8d8c0103247c5195c.png" alt="Inheritance diagram of matplotlib.dates" usemap="#inheritance1bda3e63b5" class="inheritance"/>
<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="325,65,447,87"/>
<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="191,128,263,149"/>
<area shape="rect" id="node7" href="#matplotlib.dates.DateFormatter" target="_top" title="Tick location is seconds since the epoch.  Use a :func:`strftime`" alt="" coords="337,107,434,128"/>
<area shape="rect" id="node13" href="#matplotlib.dates.IndexDateFormatter" target="_top" title="Use with :class:`~matplotlib.ticker.IndexLocator` to cycle format" alt="" coords="322,148,449,169"/>
<area shape="rect" id="node3" href="#matplotlib.dates.AutoDateLocator" target="_top" title="On autoscale, this class picks the best" alt="" coords="498,127,607,148"/>
<area shape="rect" id="node4" href="#matplotlib.dates.DateLocator" target="_top" title="Determines the tick locations when plotting dates." alt="" coords="343,189,428,210"/>
<area shape="rect" id="node10" href="#matplotlib.dates.RRuleLocator" target="_top" title="RRuleLocator" alt="" coords="508,168,597,189"/>
<area shape="rect" id="node14" href="#matplotlib.dates.MicrosecondLocator" target="_top" title="Make ticks on occurances of each microsecond." alt="" coords="489,209,615,230"/>
<area shape="rect" id="node19" href="#matplotlib.dates.YearLocator" target="_top" title="Make ticks on a given day of each year that is a multiple of base." alt="" coords="512,250,593,271"/>
<area shape="rect" id="node5" href="units_api.html#matplotlib.units.ConversionInterface" target="_top" title="The minimal interface for a converter to take custom instances (or" alt="" coords="4,87,132,108"/>
<area shape="rect" id="node8" href="ticker_api.html#matplotlib.ticker.Locator" target="_top" title="Determine the tick locations;" alt="" coords="197,189,257,210"/>
<area shape="rect" id="node9" href="#matplotlib.dates.DayLocator" target="_top" title="Make ticks on occurances of each day of the month.  For example," alt="" coords="669,64,749,85"/>
<area shape="rect" id="node12" href="#matplotlib.dates.HourLocator" target="_top" title="Make ticks on occurances of each hour." alt="" coords="667,105,751,127"/>
<area shape="rect" id="node15" href="#matplotlib.dates.MinuteLocator" target="_top" title="Make ticks on occurances of each minute." alt="" coords="661,146,757,168"/>
<area shape="rect" id="node16" href="#matplotlib.dates.MonthLocator" target="_top" title="Make ticks on occurances of each month month, e.g., 1, 3, 12." alt="" coords="663,188,755,209"/>
<area shape="rect" id="node17" href="#matplotlib.dates.SecondLocator" target="_top" title="Make ticks on occurances of each second." alt="" coords="660,229,758,250"/>
<area shape="rect" id="node18" href="#matplotlib.dates.WeekdayLocator" target="_top" title="Make ticks on occurances of each weekday." alt="" coords="655,270,764,291"/>
<area shape="rect" id="node11" href="ticker_api.html#matplotlib.ticker.TickHelper" target="_top" title="TickHelper" alt="" coords="30,169,107,190"/>
</map><div class="section" id="module-matplotlib.dates">
<span id="matplotlib-dates"></span><h2><a class="reference internal" href="#module-matplotlib.dates" title="matplotlib.dates"><code class="xref py py-mod docutils literal"><span class="pre">matplotlib.dates</span></code></a><a class="headerlink" href="#module-matplotlib.dates" title="Permalink to this headline">¶</a></h2>
<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 v3.6)"><code class="xref py py-mod docutils literal"><span class="pre">datetime</span></code></a>, the add-on modules <code class="xref py py-mod docutils literal"><span class="pre">pytz</span></code> and
<code class="xref py py-mod docutils literal"><span class="pre">dateutil</span></code>.</p>
<div class="section" id="matplotlib-date-format">
<span id="date-format"></span><h3>Matplotlib date format<a class="headerlink" href="#matplotlib-date-format" title="Permalink to this headline">¶</a></h3>
<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 v3.6)"><code class="xref py py-mod docutils literal"><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.date2num" title="matplotlib.dates.date2num"><code class="xref py py-obj docutils literal"><span class="pre">date2num</span></code></a></td>
<td>Convert datetime objects to Matplotlib dates.</td>
</tr>
<tr class="row-even"><td><a class="reference internal" href="#matplotlib.dates.num2date" title="matplotlib.dates.num2date"><code class="xref py py-obj docutils literal"><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 v3.6)"><code class="xref py py-obj docutils literal"><span class="pre">datetime</span></code></a> objects.</td>
</tr>
<tr class="row-odd"><td><a class="reference internal" href="#matplotlib.dates.num2timedelta" title="matplotlib.dates.num2timedelta"><code class="xref py py-obj docutils literal"><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 v3.6)"><code class="xref py py-obj docutils literal"><span class="pre">timedelta</span></code></a> object.</td>
</tr>
<tr class="row-even"><td><a class="reference internal" href="#matplotlib.dates.epoch2num" title="matplotlib.dates.epoch2num"><code class="xref py py-obj docutils literal"><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-odd"><td><a class="reference internal" href="#matplotlib.dates.num2epoch" title="matplotlib.dates.num2epoch"><code class="xref py py-obj docutils literal"><span class="pre">num2epoch</span></code></a></td>
<td>Convert days since 0001 to epoch.</td>
</tr>
<tr class="row-even"><td><a class="reference internal" href="#matplotlib.dates.mx2num" title="matplotlib.dates.mx2num"><code class="xref py py-obj docutils literal"><span class="pre">mx2num</span></code></a></td>
<td>Convert mx <code class="xref py py-class docutils literal"><span class="pre">datetime</span></code> instance (or sequence of mx instances) to the new date format.</td>
</tr>
<tr class="row-odd"><td><a class="reference internal" href="#matplotlib.dates.drange" title="matplotlib.dates.drange"><code class="xref py py-obj docutils literal"><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"><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"><span class="pre">timezone</span></code> is assumend. If
you want to use a custom time zone, pass a <code class="xref py py-class docutils literal"><span class="pre">pytz.timezone</span></code> 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"><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"><span class="pre">plot_date()</span></code></a>, and any
custom date tickers or locators you create.
See <a class="reference external" href="http://pythonhosted.org/pytz/">pytz</a> for information on <code class="xref py py-mod docutils literal"><span class="pre">pytz</span></code> and
timezone handling.</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"><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/en/stable/">dateutil module</a> 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">
<h3>Date tickers<a class="headerlink" href="#date-tickers" title="Permalink to this headline">¶</a></h3>
<p>Most of the date tickers can locate single or multiple values. For
example:</p>
<div class="highlight-default"><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"><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"><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"><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"><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"><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"><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"><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"><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"><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"><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"><span class="pre">RRuleLocator</span></code></a>: locate using a
<code class="xref py py-class docutils literal"><span class="pre">matplotlib.dates.rrulewrapper</span></code>. The
<code class="xref py py-class docutils literal"><span class="pre">rrulewrapper</span></code> is a simple wrapper around a
<code class="xref py py-class docutils literal"><span class="pre">dateutil.rrule</span></code> (<a class="reference external" href="https://dateutil.readthedocs.io/en/stable/">dateutil</a>) which allow almost
arbitrary date tick specifications. See <a class="reference external" href="../gallery/ticks_and_spines/date_demo_rrule.html">rrule example</a>.</li>
<li><a class="reference internal" href="#matplotlib.dates.AutoDateLocator" title="matplotlib.dates.AutoDateLocator"><code class="xref py py-class docutils literal"><span class="pre">AutoDateLocator</span></code></a>: On autoscale, this class picks the best
<code class="xref py py-class docutils literal"><span class="pre">MultipleDateLocator</span></code> to set the view limits and the tick
locations.</li>
</ul>
</div></blockquote>
</div>
<div class="section" id="date-formatters">
<h3>Date formatters<a class="headerlink" href="#date-formatters" title="Permalink to this headline">¶</a></h3>
<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"><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"><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"><span class="pre">DateFormatter</span></code></a>: use <code class="xref py py-func docutils literal"><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"><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.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="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"><p class="first"><strong>d</strong> : <a class="reference external" href="https://docs.python.org/3/library/datetime.html#datetime.datetime" title="(in Python v3.6)"><code class="xref py py-obj docutils literal"><span class="pre">datetime.datetime</span></code></a> or <code class="xref py py-obj docutils literal"><span class="pre">numpy.datetime64</span></code> or sequences of these</p>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">float or sequence of floats</p>
<blockquote class="last">
<div><p>Number of days (fraction part represents hours, minutes, seconds)
since 0001-01-01 00:00:00 UTC, plus one.</p>
</div></blockquote>
</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="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 v3.6)"><code class="xref py py-obj docutils literal"><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"><p class="first"><strong>x</strong> : float or sequence of floats</p>
<blockquote>
<div><p>Number of days (fraction part represents hours, minutes, seconds)
since 0001-01-01 00:00:00 UTC, plus one.</p>
</div></blockquote>
<p><strong>tz</strong> : string, optional</p>
<blockquote>
<div><p>Timezone of <em>x</em> (defaults to rcparams <code class="docutils literal"><span class="pre">timezone</span></code>).</p>
</div></blockquote>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first"><a class="reference external" href="https://docs.python.org/3/library/datetime.html#datetime.datetime" title="(in Python v3.6)"><code class="xref py py-obj docutils literal"><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 v3.6)"><code class="xref py py-obj docutils literal"><span class="pre">datetime</span></code></a></p>
<blockquote class="last">
<div><p>Dates are returned in timezone <em>tz</em>.</p>
<p>If <em>x</em> is a sequence, a sequence of <code class="xref py py-class docutils literal"><span class="pre">datetime</span></code> objects will
be returned.</p>
</div></blockquote>
</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="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 v3.6)"><code class="xref py py-obj docutils literal"><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 v3.6)"><code class="xref py py-obj docutils literal"><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"><p class="first"><strong>x</strong> : float, sequence of floats</p>
<blockquote>
<div><p>Number of days. The fraction part represents hours, minutes, seconds.</p>
</div></blockquote>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last"><a class="reference external" href="https://docs.python.org/3/library/datetime.html#datetime.timedelta" title="(in Python v3.6)"><code class="xref py py-obj docutils literal"><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 v3.6)"><code class="xref py py-obj docutils literal"><span class="pre">datetime.timedelta</span></code></a>]</p>
</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="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"><p class="first"><strong>dstart, dend</strong> : <a class="reference external" href="https://docs.python.org/3/library/datetime.html#datetime.datetime" title="(in Python v3.6)"><code class="xref py py-obj docutils literal"><span class="pre">datetime</span></code></a></p>
<blockquote>
<div><p>The date limits.</p>
</div></blockquote>
<p><strong>delta</strong> : <a class="reference external" href="https://docs.python.org/3/library/datetime.html#datetime.timedelta" title="(in Python v3.6)"><code class="xref py py-obj docutils literal"><span class="pre">datetime.timedelta</span></code></a></p>
<blockquote>
<div><p>Spacing of the dates.</p>
</div></blockquote>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first"><strong>drange</strong> : <a class="reference external" href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.array.html#numpy.array" title="(in NumPy v1.14)"><code class="xref py py-obj docutils literal"><span class="pre">numpy.array</span></code></a></p>
<blockquote class="last">
<div><p>A list floats representing Matplotlib dates.</p>
</div></blockquote>
</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="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="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="headerlink" href="#matplotlib.dates.mx2num" title="Permalink to this definition">¶</a></dt>
<dd><p>Convert mx <code class="xref py py-class docutils literal"><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="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"><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"><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 v3.6)"><code class="xref py py-mod docutils literal"><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"><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"><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"><span class="pre">strftime()</span></code></a> format string; <em>tz</em> is the</dt>
<dd><code class="xref py py-class docutils literal"><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>tz</em><span class="sig-paren">)</span><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>dt</em>, <em>fmt=None</em><span class="sig-paren">)</span><a class="headerlink" href="#matplotlib.dates.DateFormatter.strftime" title="Permalink to this definition">¶</a></dt>
<dd><p>Refer to documentation for datetime.strftime.</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"><span class="pre">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>
</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>dt</em>, <em>fmt=None</em><span class="sig-paren">)</span><a class="headerlink" href="#matplotlib.dates.DateFormatter.strftime_pre_1900" title="Permalink to this definition">¶</a></dt>
<dd><p>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"><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>
</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="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"><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"><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"><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="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"><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"><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"><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"><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"><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"><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"><span class="pre">self.scaled</span></code> are greater than the unit
returned by <code class="docutils literal"><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="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"><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"><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><span class="sig-paren">)</span><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>vmin</em>, <em>vmax</em><span class="sig-paren">)</span><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>tz</em><span class="sig-paren">)</span><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><span class="sig-paren">)</span><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="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"><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><span class="sig-paren">)</span><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="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>vmin</em>, <em>vmax</em><span class="sig-paren">)</span><a class="headerlink" href="#matplotlib.dates.RRuleLocator.tick_values" title="Permalink to this definition">¶</a></dt>
<dd></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=False</em><span class="sig-paren">)</span><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"><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"><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"><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"><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"><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"><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><span class="sig-paren">)</span><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>dmin</em>, <em>dmax</em><span class="sig-paren">)</span><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>vmin</em>, <em>vmax</em><span class="sig-paren">)</span><a class="headerlink" href="#matplotlib.dates.AutoDateLocator.nonsingular" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
<dl class="method">
<dt id="matplotlib.dates.AutoDateLocator.refresh">
<code class="descname">refresh</code><span class="sig-paren">(</span><span class="sig-paren">)</span><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>axis</em><span class="sig-paren">)</span><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>vmin</em>, <em>vmax</em><span class="sig-paren">)</span><a class="headerlink" href="#matplotlib.dates.AutoDateLocator.tick_values" title="Permalink to this definition">¶</a></dt>
<dd></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="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"><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"><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><span class="sig-paren">)</span><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>vmin</em>, <em>vmax</em><span class="sig-paren">)</span><a class="headerlink" href="#matplotlib.dates.YearLocator.tick_values" title="Permalink to this definition">¶</a></dt>
<dd></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="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"><span class="pre">matplotlib.dates.RRuleLocator</span></code></a></p>
<p>Make ticks on occurances of each month 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"><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"><span class="pre">interval=2</span></code>, mark every second occurance.</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="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"><span class="pre">matplotlib.dates.RRuleLocator</span></code></a></p>
<p>Make ticks on occurances 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 <code class="xref py py-mod docutils literal"><span class="pre">dateutil.rrule</span></code>, 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"><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"><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="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"><span class="pre">matplotlib.dates.RRuleLocator</span></code></a></p>
<p>Make ticks on occurances 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"><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="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"><span class="pre">matplotlib.dates.RRuleLocator</span></code></a></p>
<p>Make ticks on occurances 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"><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"><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="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"><span class="pre">matplotlib.dates.RRuleLocator</span></code></a></p>
<p>Make ticks on occurances 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"><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"><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="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"><span class="pre">matplotlib.dates.RRuleLocator</span></code></a></p>
<p>Make ticks on occurances 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"><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"><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="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"><span class="pre">matplotlib.dates.DateLocator</span></code></a></p>
<p>Make ticks on occurances of each microsecond.</p>
<p><em>interval</em> is the interval between each iteration. For
example, if <code class="docutils literal"><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>axis</em><span class="sig-paren">)</span><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>vmin</em>, <em>vmax</em><span class="sig-paren">)</span><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>vmin</em>, <em>vmax</em><span class="sig-paren">)</span><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>vmin</em>, <em>vmax</em><span class="sig-paren">)</span><a class="headerlink" href="#matplotlib.dates.MicrosecondLocator.tick_values" title="Permalink to this definition">¶</a></dt>
<dd></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="headerlink" href="#matplotlib.dates.rrule" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <code class="xref py py-class docutils literal"><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,
which was renamed to byweekday) and more. The constructor prototype is:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">rrule</span><span class="p">(</span><span class="n">freq</span><span class="p">)</span>
</pre></div>
</div>
<p>Where freq must be one of YEARLY, MONTHLY, WEEKLY, DAILY, HOURLY, MINUTELY,
or SECONDLY.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p>Per RFC section 3.3.10, recurrence instances falling on invalid dates
and times are ignored rather than coerced:</p>
<blockquote>
<div>Recurrence rules may generate recurrence instances with an invalid
date (e.g., February 30) or nonexistent local time (e.g., 1:30 AM
on a day where the local time is moved forward by an hour at 1:00
AM). Such recurrence instances MUST be ignored and MUST NOT be
counted as part of the recurrence set.</div></blockquote>
<p>This can lead to possibly surprising behavior when, for example, the
start date occurs at the end of the month:</p>
<div class="last highlight-default"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">from</span> <span class="nn">dateutil.rrule</span> <span class="k">import</span> <span class="n">rrule</span><span class="p">,</span> <span class="n">MONTHLY</span>
<span class="gp">>>> </span><span class="kn">from</span> <span class="nn">datetime</span> <span class="k">import</span> <span class="n">datetime</span>
<span class="gp">>>> </span><span class="n">start_date</span> <span class="o">=</span> <span class="n">datetime</span><span class="p">(</span><span class="mi">2014</span><span class="p">,</span> <span class="mi">12</span><span class="p">,</span> <span class="mi">31</span><span class="p">)</span>
<span class="gp">>>> </span><span class="nb">list</span><span class="p">(</span><span class="n">rrule</span><span class="p">(</span><span class="n">freq</span><span class="o">=</span><span class="n">MONTHLY</span><span class="p">,</span> <span class="n">count</span><span class="o">=</span><span class="mi">4</span><span class="p">,</span> <span class="n">dtstart</span><span class="o">=</span><span class="n">start_date</span><span class="p">))</span>
<span class="gp">... </span>
<span class="go">[datetime.datetime(2014, 12, 31, 0, 0),</span>
<span class="go"> datetime.datetime(2015, 1, 31, 0, 0),</span>
<span class="go"> datetime.datetime(2015, 3, 31, 0, 0),</span>
<span class="go"> datetime.datetime(2015, 5, 31, 0, 0)]</span>
</pre></div>
</div>
</div>
<p>Additionally, it supports the following keyword arguments:</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"><ul class="first last simple">
<li><strong>cache</strong> – If given, it must be a boolean value specifying to enable or disable
caching of results. If you will use the same rrule instance multiple
times, enabling caching will improve the performance considerably.</li>
<li><strong>dtstart</strong> – The recurrence start. Besides being the base for the recurrence,
missing parameters in the final recurrence instances will also be
extracted from this date. If not given, datetime.now() will be used
instead.</li>
<li><strong>interval</strong> – The interval between each freq iteration. For example, when using
YEARLY, an interval of 2 means once every two years, but with HOURLY,
it means once every two hours. The default interval is 1.</li>
<li><strong>wkst</strong> – The week start day. Must be one of the MO, TU, WE constants, or an
integer, specifying the first day of the week. This will affect
recurrences based on weekly periods. The default week start is got
from calendar.firstweekday(), and may be modified by
calendar.setfirstweekday().</li>
<li><strong>count</strong> – <p>How many occurrences will be generated.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">As of version 2.5.0, the use of the <code class="docutils literal"><span class="pre">until</span></code> keyword together
with the <code class="docutils literal"><span class="pre">count</span></code> keyword is deprecated per RFC-2445 Sec. 4.3.10.</p>
</div>
</li>
<li><strong>until</strong> – <p>If given, this must be a datetime instance, that will specify the
limit of the recurrence. The last recurrence in the rule is the greatest
datetime that is less than or equal to the value specified in the
<code class="docutils literal"><span class="pre">until</span></code> parameter.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">As of version 2.5.0, the use of the <code class="docutils literal"><span class="pre">until</span></code> keyword together
with the <code class="docutils literal"><span class="pre">count</span></code> keyword is deprecated per RFC-2445 Sec. 4.3.10.</p>
</div>
</li>
<li><strong>bysetpos</strong> – If given, it must be either an integer, or a sequence of integers,
positive or negative. Each given integer will specify an occurrence
number, corresponding to the nth occurrence of the rule inside the
frequency period. For example, a bysetpos of -1 if combined with a
MONTHLY frequency, and a byweekday of (MO, TU, WE, TH, FR), will
result in the last work day of every month.</li>
<li><strong>bymonth</strong> – If given, it must be either an integer, or a sequence of integers,
meaning the months to apply the recurrence to.</li>
<li><strong>bymonthday</strong> – If given, it must be either an integer, or a sequence of integers,
meaning the month days to apply the recurrence to.</li>
<li><strong>byyearday</strong> – If given, it must be either an integer, or a sequence of integers,
meaning the year days to apply the recurrence to.</li>
<li><strong>byweekno</strong> – If given, it must be either an integer, or a sequence of integers,
meaning the week numbers to apply the recurrence to. Week numbers
have the meaning described in ISO8601, that is, the first week of
the year is that containing at least four days of the new year.</li>
<li><strong>byweekday</strong> – If given, it must be either an integer (0 == MO), a sequence of
integers, one of the weekday constants (MO, TU, etc), or a sequence
of these constants. When given, these variables will define the
weekdays where the recurrence will be applied. It’s also possible to
use an argument n for the weekday instances, which will mean the nth
occurrence of this weekday in the period. For example, with MONTHLY,
or with YEARLY and BYMONTH, using FR(+1) in byweekday will specify the
first friday of the month where the recurrence happens. Notice that in
the RFC documentation, this is specified as BYDAY, but was renamed to
avoid the ambiguity of that keyword.</li>
<li><strong>byhour</strong> – If given, it must be either an integer, or a sequence of integers,
meaning the hours to apply the recurrence to.</li>
<li><strong>byminute</strong> – If given, it must be either an integer, or a sequence of integers,
meaning the minutes to apply the recurrence to.</li>
<li><strong>bysecond</strong> – If given, it must be either an integer, or a sequence of integers,
meaning the seconds to apply the recurrence to.</li>
<li><strong>byeaster</strong> – If given, it must be either an integer, or a sequence of integers,
positive or negative. Each integer will define an offset from the
Easter Sunday. Passing the offset 0 to byeaster will yield the Easter
Sunday itself. This is an extension to the RFC specification.</li>
</ul>
</td>
</tr>
</tbody>
</table>
<dl class="method">
<dt id="matplotlib.dates.rrule.replace">
<code class="descname">replace</code><span class="sig-paren">(</span><em>**kwargs</em><span class="sig-paren">)</span><a class="headerlink" href="#matplotlib.dates.rrule.replace" title="Permalink to this definition">¶</a></dt>
<dd><p>Return new rrule with same attributes except for those attributes given new
values by whichever keyword arguments are specified.</p>
</dd></dl>
</dd></dl>
<dl class="class">
<dt id="matplotlib.dates.relativedelta">
<em class="property">class </em><code class="descclassname">matplotlib.dates.</code><code class="descname">relativedelta</code><span class="sig-paren">(</span><em>dt1=None</em>, <em>dt2=None</em>, <em>years=0</em>, <em>months=0</em>, <em>days=0</em>, <em>leapdays=0</em>, <em>weeks=0</em>, <em>hours=0</em>, <em>minutes=0</em>, <em>seconds=0</em>, <em>microseconds=0</em>, <em>year=None</em>, <em>month=None</em>, <em>day=None</em>, <em>weekday=None</em>, <em>yearday=None</em>, <em>nlyearday=None</em>, <em>hour=None</em>, <em>minute=None</em>, <em>second=None</em>, <em>microsecond=None</em><span class="sig-paren">)</span><a class="headerlink" href="#matplotlib.dates.relativedelta" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <a class="reference external" href="https://docs.python.org/3/library/functions.html#object" title="(in Python v3.6)"><code class="xref py py-class docutils literal"><span class="pre">object</span></code></a></p>
<p>The relativedelta type is based on the specification of the excellent
work done by M.-A. Lemburg in his
<a class="reference external" href="http://www.egenix.com/files/python/mxDateTime.html">mx.DateTime</a> extension.
However, notice that this type does <em>NOT</em> implement the same algorithm as
his work. Do <em>NOT</em> expect it to behave like mx.DateTime’s counterpart.</p>
<p>There are two different ways to build a relativedelta instance. The
first one is passing it two date/datetime classes:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">relativedelta</span><span class="p">(</span><span class="n">datetime1</span><span class="p">,</span> <span class="n">datetime2</span><span class="p">)</span>
</pre></div>
</div>
<p>The second one is passing it any number of the following keyword arguments:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">relativedelta</span><span class="p">(</span><span class="n">arg1</span><span class="o">=</span><span class="n">x</span><span class="p">,</span><span class="n">arg2</span><span class="o">=</span><span class="n">y</span><span class="p">,</span><span class="n">arg3</span><span class="o">=</span><span class="n">z</span><span class="o">...</span><span class="p">)</span>
<span class="n">year</span><span class="p">,</span> <span class="n">month</span><span class="p">,</span> <span class="n">day</span><span class="p">,</span> <span class="n">hour</span><span class="p">,</span> <span class="n">minute</span><span class="p">,</span> <span class="n">second</span><span class="p">,</span> <span class="n">microsecond</span><span class="p">:</span>
<span class="n">Absolute</span> <span class="n">information</span> <span class="p">(</span><span class="n">argument</span> <span class="ow">is</span> <span class="n">singular</span><span class="p">);</span> <span class="n">adding</span> <span class="ow">or</span> <span class="n">subtracting</span> <span class="n">a</span>
<span class="n">relativedelta</span> <span class="k">with</span> <span class="n">absolute</span> <span class="n">information</span> <span class="n">does</span> <span class="ow">not</span> <span class="n">perform</span> <span class="n">an</span> <span class="n">aritmetic</span>
<span class="n">operation</span><span class="p">,</span> <span class="n">but</span> <span class="n">rather</span> <span class="n">REPLACES</span> <span class="n">the</span> <span class="n">corresponding</span> <span class="n">value</span> <span class="ow">in</span> <span class="n">the</span>
<span class="n">original</span> <span class="n">datetime</span> <span class="k">with</span> <span class="n">the</span> <span class="n">value</span><span class="p">(</span><span class="n">s</span><span class="p">)</span> <span class="ow">in</span> <span class="n">relativedelta</span><span class="o">.</span>
<span class="n">years</span><span class="p">,</span> <span class="n">months</span><span class="p">,</span> <span class="n">weeks</span><span class="p">,</span> <span class="n">days</span><span class="p">,</span> <span class="n">hours</span><span class="p">,</span> <span class="n">minutes</span><span class="p">,</span> <span class="n">seconds</span><span class="p">,</span> <span class="n">microseconds</span><span class="p">:</span>
<span class="n">Relative</span> <span class="n">information</span><span class="p">,</span> <span class="n">may</span> <span class="n">be</span> <span class="n">negative</span> <span class="p">(</span><span class="n">argument</span> <span class="ow">is</span> <span class="n">plural</span><span class="p">);</span> <span class="n">adding</span>
<span class="ow">or</span> <span class="n">subtracting</span> <span class="n">a</span> <span class="n">relativedelta</span> <span class="k">with</span> <span class="n">relative</span> <span class="n">information</span> <span class="n">performs</span>
<span class="n">the</span> <span class="n">corresponding</span> <span class="n">aritmetic</span> <span class="n">operation</span> <span class="n">on</span> <span class="n">the</span> <span class="n">original</span> <span class="n">datetime</span> <span class="n">value</span>
<span class="k">with</span> <span class="n">the</span> <span class="n">information</span> <span class="ow">in</span> <span class="n">the</span> <span class="n">relativedelta</span><span class="o">.</span>
<span class="n">weekday</span><span class="p">:</span>
<span class="n">One</span> <span class="n">of</span> <span class="n">the</span> <span class="n">weekday</span> <span class="n">instances</span> <span class="p">(</span><span class="n">MO</span><span class="p">,</span> <span class="n">TU</span><span class="p">,</span> <span class="n">etc</span><span class="p">)</span><span class="o">.</span> <span class="n">These</span> <span class="n">instances</span> <span class="n">may</span>
<span class="n">receive</span> <span class="n">a</span> <span class="n">parameter</span> <span class="n">N</span><span class="p">,</span> <span class="n">specifying</span> <span class="n">the</span> <span class="n">Nth</span> <span class="n">weekday</span><span class="p">,</span> <span class="n">which</span> <span class="n">could</span>
<span class="n">be</span> <span class="n">positive</span> <span class="ow">or</span> <span class="n">negative</span> <span class="p">(</span><span class="n">like</span> <span class="n">MO</span><span class="p">(</span><span class="o">+</span><span class="mi">1</span><span class="p">)</span> <span class="ow">or</span> <span class="n">MO</span><span class="p">(</span><span class="o">-</span><span class="mi">2</span><span class="p">)</span><span class="o">.</span> <span class="n">Not</span> <span class="n">specifying</span>
<span class="n">it</span> <span class="ow">is</span> <span class="n">the</span> <span class="n">same</span> <span class="k">as</span> <span class="n">specifying</span> <span class="o">+</span><span class="mf">1.</span> <span class="n">You</span> <span class="n">can</span> <span class="n">also</span> <span class="n">use</span> <span class="n">an</span> <span class="n">integer</span><span class="p">,</span>
<span class="n">where</span> <span class="mi">0</span><span class="o">=</span><span class="n">MO</span><span class="o">.</span>
<span class="n">leapdays</span><span class="p">:</span>
<span class="n">Will</span> <span class="n">add</span> <span class="n">given</span> <span class="n">days</span> <span class="n">to</span> <span class="n">the</span> <span class="n">date</span> <span class="n">found</span><span class="p">,</span> <span class="k">if</span> <span class="n">year</span> <span class="ow">is</span> <span class="n">a</span> <span class="n">leap</span>
<span class="n">year</span><span class="p">,</span> <span class="ow">and</span> <span class="n">the</span> <span class="n">date</span> <span class="n">found</span> <span class="ow">is</span> <span class="n">post</span> <span class="mi">28</span> <span class="n">of</span> <span class="n">february</span><span class="o">.</span>
<span class="n">yearday</span><span class="p">,</span> <span class="n">nlyearday</span><span class="p">:</span>
<span class="n">Set</span> <span class="n">the</span> <span class="n">yearday</span> <span class="ow">or</span> <span class="n">the</span> <span class="n">non</span><span class="o">-</span><span class="n">leap</span> <span class="n">year</span> <span class="n">day</span> <span class="p">(</span><span class="n">jump</span> <span class="n">leap</span> <span class="n">days</span><span class="p">)</span><span class="o">.</span>
<span class="n">These</span> <span class="n">are</span> <span class="n">converted</span> <span class="n">to</span> <span class="n">day</span><span class="o">/</span><span class="n">month</span><span class="o">/</span><span class="n">leapdays</span> <span class="n">information</span><span class="o">.</span>
</pre></div>
</div>
<p>Here is the behavior of operations with relativedelta:</p>
<ol class="arabic simple">
<li>Calculate the absolute year, using the ‘year’ argument, or the
original datetime year, if the argument is not present.</li>
<li>Add the relative ‘years’ argument to the absolute year.</li>
<li>Do steps 1 and 2 for month/months.</li>
<li>Calculate the absolute day, using the ‘day’ argument, or the
original datetime day, if the argument is not present. Then,
subtract from the day until it fits in the year and month
found after their operations.</li>
You can’t perform that action at this time.