gistfile1.txt

>>> delta = datetime.timedelta(days=200)
>>> tz = pytz.timezone('Europe/Bucharest')
>>> datetime_dt = datetime.datetime(2019, 1, 1, tzinfo=tz)
>>> print('datetime.datetime(2019, 1, 1, tzinfo=tz):', datetime_dt.isoformat())
datetime.datetime(2019, 1, 1, tzinfo=tz): 2019-01-01T00:00:00+01:44
>>> datetime_dt = tz.localize(datetime.datetime(2019, 1, 1))
>>> print('tz.localize(datetime.datetime(2019, 1, 1)):', datetime_dt.isoformat())
tz.localize(datetime.datetime(2019, 1, 1)): 2019-01-01T00:00:00+02:00
>>>
>>> print('datetime + delta:', (datetime_dt + delta).isoformat())
datetime + delta: 2019-07-20T00:00:00+02:00
>>> print('datetime delta:', (datetime_dt + delta) - datetime_dt)
datetime delta: 200 days, 0:00:00
>>> print('datetime + delta (tz.normalize):', tz.normalize(datetime_dt + delta).isoformat())
datetime + delta (tz.normalize): 2019-07-20T01:00:00+03:00
>>> print('datetime delta (tz.normalize):', tz.normalize(datetime_dt + delta) - datetime_dt)
datetime delta (tz.normalize): 200 days, 0:00:00
>>>
>>> arrow_dt = arrow.Arrow(2019, 1, 1, tzinfo='Europe/Bucharest')
>>> print('arrow:', arrow_dt.isoformat())
arrow: 2019-01-01T00:00:00+02:00
>>> print('arrow shift:', arrow_dt.shift(days=200).isoformat())
arrow shift: 2019-07-20T00:00:00+03:00
>>> print('arrow delta:', arrow_dt.shift(days=200) - arrow_dt)
arrow delta: 200 days, 0:00:00
>>>
>>> moment_dt = moment.date(2019, 1, 1).timezone('Europe/Bucharest')
>>> print('moment:', moment_dt.isoformat())
moment: 2019-01-01T02:00:00+02:00
>>> print('moment add:', moment_dt.add(days=200).isoformat())
moment add: 2019-07-20T02:00:00+03:00
>>> print('moment delta:', moment_dt.add(days=200) - moment_dt)
moment delta: 0:00:00
>>>
>>> delorean_dt = delorean.Delorean(datetime.datetime(2019, 1, 1), timezone='Europe/Bucharest')
>>> print('delorean:', delorean_dt.format_datetime('long'))
delorean: January 1, 2019 at 12:00:00 AM +0200
>>> print('delorean add:', (delorean_dt + delta).format_datetime('long'))
delorean add: July 20, 2019 at 12:00:00 AM +0200
>>> print('delorean delta:', (delorean_dt + delta) - delorean_dt)
delorean delta: 200 days, 0:00:00
>>>
>>> pendulum_dt = pendulum.datetime(2019, 1, 1, tz='Europe/Bucharest')
>>> print('pendulum:', pendulum_dt.isoformat())
pendulum: 2019-01-01T00:00:00+02:00
>>> print('pendulum add:', pendulum_dt.add(days=200).isoformat())
pendulum add: 2019-07-20T00:00:00+03:00
>>> pendulum_delta = pendulum_dt.add(days=200) - pendulum_dt
>>> print('pendulum delta:', pendulum_delta, 'days:', pendulum_delta.days)
pendulum delta: <Period [2019-01-01T00:00:00+02:00 -> 2019-07-20T00:00:00+03:00]> days: 199

gistfile2.txt

datetime.datetime(2019, 1, 1, tzinfo=tz): 2019-01-01T00:00:00+01:44
tz.localize(datetime.datetime(2019, 1, 1)): 2019-01-01T00:00:00+02:00
datetime + delta: 2019-07-20T00:00:00+02:00
datetime delta: 200 days, 0:00:00
datetime + delta (tz.normalize): 2019-07-20T01:00:00+03:00
datetime delta (tz.normalize): 200 days, 0:00:00
arrow: 2019-01-01T00:00:00+02:00
arrow shift: 2019-07-20T00:00:00+03:00
arrow delta: 200 days, 0:00:00
moment: 2019-01-01T02:00:00+02:00
moment add: 2019-07-20T02:00:00+03:00
moment delta: 0:00:00
delorean: January 1, 2019 at 12:00:00 AM +0200
delorean add: July 20, 2019 at 12:00:00 AM +0200
delorean delta: 200 days, 0:00:00
pendulum: 2019-01-01T00:00:00+02:00
pendulum add: 2019-07-20T00:00:00+03:00
pendulum delta: <Period [2019-01-01T00:00:00+02:00 -> 2019-07-20T00:00:00+03:00]> days: 199