#!/usr/bin/env python
# coding: utf-8

# In[1]:


# 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


# In[2]:


# 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)


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# Example 2
from time import mktime, strptime

time_tuple = strptime(time_str, time_format)
utc_now = mktime(time_tuple)
print(utc_now)


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# 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)


# In[5]:


# 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


# In[6]:


# 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)


# In[7]:


# 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)


# In[8]:


# 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)


# In[9]:


# Example 8
pacific = pytz.timezone('US/Pacific')
sf_dt = pacific.normalize(utc_dt.astimezone(pacific))
print(sf_dt)


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# Example 9
nepal = pytz.timezone('Asia/Katmandu')
nepal_dt = nepal.normalize(utc_dt.astimezone(nepal))
print(nepal_dt)