In [1]:

    

import datetime
import pytz


    

In [2]:

    

jst = pytz.timezone('Asia/Tokyo')


    

In [3]:

    

print(jst)


    

    




Asia/Tokyo

In [4]:

    

eastern = pytz.timezone('US/Eastern')


    

In [5]:

    

print(eastern)


    

    




US/Eastern

In [6]:

    

print(type(jst))


    

    




<class 'pytz.tzfile.Asia/Tokyo'>

In [7]:

    

print(issubclass(type(jst), datetime.tzinfo))


    

    




True

In [8]:

    

dt_aware = datetime.datetime(2018, 12, 31, 5, 0, 30, 1000,
                             tzinfo=datetime.timezone.utc)


    

In [9]:

    

print(dt_aware)


    

    




2018-12-31 05:00:30.001000+00:00

In [10]:

    

print(dt_aware.astimezone(jst))


    

    




2018-12-31 14:00:30.001000+09:00

In [11]:

    

print(dt_aware.astimezone(eastern))


    

    




2018-12-31 00:00:30.001000-05:00

In [12]:

    

print(dt_aware.replace(tzinfo=jst))


    

    




2018-12-31 05:00:30.001000+09:19

In [13]:

    

print(dt_aware.replace(tzinfo=eastern))


    

    




2018-12-31 05:00:30.001000-04:56

In [14]:

    

print(jst.localize(dt_aware.replace(tzinfo=None)))


    

    




2018-12-31 05:00:30.001000+09:00

In [15]:

    

print(eastern.localize(dt_aware.replace(tzinfo=None)))


    

    




2018-12-31 05:00:30.001000-05:00

In [16]:

    

dt_naive = datetime.datetime(2018, 12, 31, 5, 0, 30, 1000)


    

In [17]:

    

print(dt_naive)


    

    




2018-12-31 05:00:30.001000

In [18]:

    

print(dt_naive.replace(tzinfo=jst))


    

    




2018-12-31 05:00:30.001000+09:19

In [19]:

    

print(dt_naive.replace(tzinfo=eastern))


    

    




2018-12-31 05:00:30.001000-04:56

In [20]:

    

print(jst.localize(dt_naive))


    

    




2018-12-31 05:00:30.001000+09:00

In [21]:

    

print(eastern.localize(dt_naive))


    

    




2018-12-31 05:00:30.001000-05:00

In [22]:

    

print(datetime.datetime(2018, 12, 31, 5, 0, 30, 1000,
                        tzinfo=jst))


    

    




2018-12-31 05:00:30.001000+09:19

In [23]:

    

print(jst.localize(datetime.datetime(2018, 12, 31, 5, 0, 30, 1000)))


    

    




2018-12-31 05:00:30.001000+09:00

In [24]:

    

print(datetime.datetime.now(jst))


    

    




2019-01-21 00:00:42.540529+09:00

In [25]:

    

dt_dst = datetime.datetime(2018, 3, 11, 2, 0, 0, 0)


    

In [26]:

    

print(eastern.localize(dt_dst))


    

    




2018-03-11 02:00:00-05:00

In [27]:

    

print(eastern.normalize(eastern.localize(dt_dst)))


    

    




2018-03-11 03:00:00-04:00