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#!/usr/bin/env python3

# Copyright 2014 Brett Slatkin, Pearson Education Inc.

#

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

#

# http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

# Preamble to mimick book environment

import logging

from pprint import pprint

from sys import stdout as STDOUT

# Example 1

from time import localtime, strftime

now = 1407694710

local_tuple = localtime(now)

time_format = '%Y-%m-%d %H:%M:%S'

time_str = strftime(time_format, local_tuple)

print(time_str)

# Example 2

from time import mktime, strptime

time_tuple = strptime(time_str, time_format)

utc_now = mktime(time_tuple)

print(utc_now)

# Example 3

parse_format = '%Y-%m-%d %H:%M:%S %Z'

depart_sfo = '2014-05-01 15:45:16 PDT'

time_tuple = strptime(depart_sfo, parse_format)

time_str = strftime(time_format, time_tuple)

print(time_str)

# Example 4

try:

arrival_nyc = '2014-05-01 23:33:24 EDT'

time_tuple = strptime(arrival_nyc, time_format)

except:

logging.exception('Expected')

else:

assert False

# Example 5

from datetime import datetime, timezone

now = datetime(2014, 8, 10, 18, 18, 30)

now_utc = now.replace(tzinfo=timezone.utc)

now_local = now_utc.astimezone()

print(now_local)

# Example 6

time_str = '2014-08-10 11:18:30'

now = datetime.strptime(time_str, time_format)

time_tuple = now.timetuple()

utc_now = mktime(time_tuple)

print(utc_now)

# Example 7

import pytz

arrival_nyc = '2014-05-01 23:33:24'

nyc_dt_naive = datetime.strptime(arrival_nyc, time_format)

eastern = pytz.timezone('US/Eastern')

nyc_dt = eastern.localize(nyc_dt_naive)

utc_dt = pytz.utc.normalize(nyc_dt.astimezone(pytz.utc))

print(utc_dt)

# Example 8

pacific = pytz.timezone('US/Pacific')

sf_dt = pacific.normalize(utc_dt.astimezone(pacific))

print(sf_dt)

# Example 9

nepal = pytz.timezone('Asia/Katmandu')

nepal_dt = nepal.normalize(utc_dt.astimezone(nepal))

print(nepal_dt)