23_datetime

# data & time
import datetime
import pytz       # python timezone library
# basic date
# ---------------------------------

dat1 = datetime.date.today()    # current date
print(dat1)                     # full date
# print(dat1.day)               # current day
# print(dat1.year)              # current year
# print(dat1.month)             # current month

# weekday vs, isoweekday
# ---------------------------
    # week from 0-6 & isoweek from 1-7
# print(dat1.weekday())
# print(dat1.isoweekday())

# adding & subtracting date
# ---------------------------

# sevenDays = datetime.timedelta(days=7)
# print('seven days later: ', dat1 + sevenDays)
# print('seven days back: ', dat1 - sevenDays)

# simple example: total days from birthday

# myBirth = datetime.date(2018, 12, 8)
# dayCount = myBirth - dat1
# print(dayCount.days)  # only days
# print(dayCount.total_seconds())  # only sec


# python time zone
# -------------------------

# dateTimee = datetime.datetime(2018, 9, 6, 7, 26, 40, tzinfo=pytz.UTC)
# print(dateTimee)
dateTimee_now = datetime.datetime.now(tz=pytz.UTC)
# print(dateTimee_now)
myZone = dateTimee_now.astimezone(pytz.timezone('Etc/GMT +6.0'))
# print(myZone)
# print all timezone
# -----------------------
# for tz in pytz.all_timezones:
#     print(tz)