pip install pytime

>>>from pytime import pytime
>>>
>>>pytime.before('2015.5.17', '2years 3mon 23week 3d 2hr')     # 2years 3months 23weeks 3days 2hours before 2015.5.17
datetime.datetime(2012, 9, 5, 22, 0)
>>>
>>>pytime.after(pytime.tomorrow('15.5.17'), '23month3dy29minu')   # 23months 3days 29minutes after 2015-5-17's next day
datetime.datetime(2017, 4, 21, 0, 29)

>>>pytime.parse('April 3rd 2015')
datetime.date(2015, 4, 3)
>>>pytime.parse('Oct, 1st. 2015')
datetime.date(2015, 10, 1)
>>>pytime.parse('NOV21th2015')
datetime.date(2015, 11, 21)
>>>
>>>pytime.parse('2015517')
datetime.date(2015, 5, 17)
>>>
>>>pytime.parse('5/17/15')
datetime.date(2015, 5, 17)
>>>
>>>pytime.parse('92-11-2')
datetime.date(1992, 11, 2)
>>>
>>>pytime.parse(1432310400)          # support datetimestamp for all function
datetime.datetime(2015, 5, 23, 0, 0)

>>>pytime.this_week()
(datetime.date(2015, 5, 11), datetime.date(2015, 5, 18))

>>>pytime.next_week('2015-6-14')                         # 2015-6-14's next week for script
(datetime.date(2015, 6, 15), datetime.date(2015, 6, 23))

>>>pytime.last_week(pytime.mother(2013), True)           # 2013 Mother's Day's last week
(datetime.date(2013, 5, 13), datetime.date(2013, 5, 20))

>>>pytime.next_month('2015-10-1')
(datetime.date(2015, 11, 1), datetime.date(2015, 12, 1))

>>>pytime.count('2015-5-17 23:23:23', pytime.tomorrow())
datetime.timedelta(1, 84203)

>>>pytime.father()              # Father's Day
datetime.date(2015, 6, 21)
>>>
>>>pytime.mother(2016)          # 2016 Mother's Day
datetime.date(2016, 5, 8)
>>>
>>>pytime.easter(1999)          # 1999 Easter
datetime.date(1999, 4, 4)
>>>pytime.vatertag(2020)        # Fater's Day in Germany
datetime.date(2020, 5, 21)

>>>pytime.days_range('2015-5-17', '2015-5-23')
[datetime.date(2015, 5, 23),
 datetime.date(2015, 5, 22),
 datetime.date(2015, 5, 21),
 datetime.date(2015, 5, 20),
 datetime.date(2015, 5, 19),
 datetime.date(2015, 5, 18),
 datetime.date(2015, 5, 17)]