pip install pendulum

import pendulum

now = pendulum.now()  # '2016-08-18 20:24:52'

now.add(days=1)  # '2016-08-19 20:24:52'

now.add(weeks=1, hours=2)  # '2016-08-25 22:24:52'

now.subtract(weeks=1)  # '2016-08-11 20:24:52'

birthday = pendulum.create(1988, 10, 22)
birthday.age  # 27

now = pendulum.now('Europe/Helsinki')
future = now.add(hours=12)
past = now.subtract(years=50, days=12)

future.diff()             # '<Period [11 hours 59 minutes 41 seconds]>'
future.diff_for_humans()  # '11 hours from now'
past.diff_for_humans()    # '50 years ago'

delta = now - last_week

delta.start  # <Pendulum [2016-08-05T00:28:26.207225+03:00]>
delta.end    # <Pendulum [2016-08-12T00:28:26.207225+03:00]>

delta.in_days()      # 7
delta.in_hours()     # 168
delta.in_weekdays()  # 6
delta.in_words()     # '1 week'

it = pendulum.interval(days=15)

it.weeks       # 2
it.days        # 15
it.in_hours()  # 360
it.in_words()  # '2 weeks 1 day'

now.is_birthday()
now.is_future()
now.is_past()

now.is_monday()
now.is_tuesday()
now.is_wednesday()
now.is_thursday()
now.is_friday()
now.is_saturday()
now.is_sunday()

now.is_today()
now.is_yesterday()
now.is_tomorrow()

now.is_leap_year()
now.is_long_year()

now.is_same_day()
now.is_weekday()
now.is_weekend()

now = pendulum.now()          # 2016-08-18 20:24:52
next_year = now.add(years=1)  # 2017-08-18 20:24:52

now.is_birthday(next_year)    # True
now.is_same_day(next_year)    # False

date = datetime.datetime(2016, 1, 1) # datetime.datetime(2016, 1, 1, 0, 0)
pendulum.instance(date)              # <Pendulum [2016-01-01T00:00:00+00:00]>

pendulum.now()                       # <Pendulum [2016-08-18T21:12:27.684083+03:00]>
pendulum.utcnow()                    # <Pendulum [2016-08-18T21:12:56.711154+00:00]>

pendulum.today()                     # <Pendulum [2016-08-18T00:00:00+03:00]>
pendulum.tomorrow()                  # <Pendulum [2016-08-19T00:00:00+03:00]>
pendulum.yesterday()                 # <Pendulum [2016-08-17T00:00:00+03:00]>

pendulum.create(2017, 6, 1)          # <Pendulum [2017-06-01T21:17:11.868599+00:00]>

pendulum.parse('2016-08-18')         # <Pendulum [2016-08-18T00:00:00+00:00]>