Date and Time manipulation in python

dateAndtime.py

import datetime
import pytz

tday = datetime.date.today()
bday = datime.date(2017,8,17)

#Example1
#Time until my bday
till_bday = bday - tday  #timedelta object
print(till_bday)

#Example2
dt = datetime.datetime(2016,11,26,12,30,45,100000)
tdelta = datetime.timedelta(hours=13)
print(dt + tdelta)

#Example3 - No Timezone aware

dt_today = datetime.datetime.today()  #2016-11-26 09:40:29.934950 Timezone = None
dt_now = datetime.datetime.now() #2016-11-26 09:40:34.211644 without Timezone
dt_utcnow = datetime.datetime.utcnow() #2016-11-26 14:40:38.180928

print(dt_today)
print(dt_now)
print(dt_utcnow)

#Example4 - pytz

dt = datetime.datetime(2016,11,26,12,30,45, tzinfo=pytz.UTC)
dt_utcnow = datetime.datetime.now(tz=pytz.UTC) #2016-11-26 14:52:17.721137+00:00

#from utc to eastern time
dt_east = dt_utcnow.astimezone(pytz.timezone('US/Eastern'))

#Example 5 from east to west
dt_east = datetime.datetime.now()
east_tz = pytz.timezone('US/Eastern')
dt_east = east_tz.localize(dt_east)

dt_west = dt_east.astimezone(pytz.timezone('US/Pacific'))
                               
#Example 5 - ISO Format

dt = datetime.datetime.now(tz=pytz.timezone('US/Eastern'))
print(dt.strftime('%B %d, %Y')) #November 26, 2016

#Example 6 -  string to datetime

dt_str = 'November 26, 2016'
dt = datetime.datetime.strptime(dt_str, '%B %d, %Y')


#######Print all pytz timeZones#############
#for tz in pytz.all_timezones:
   #print(tz)