How to convert datetime like `2021-06-25 15:00:08+00:00` to local timezone datetime.datetime python?

Question

I have many datetime.datetime object like 2021-06-25 15:00:08+00:00 where the timezone is different for different data.Eg.another data is 2021-06-24 06:33:06-07:00 .I want to save all of them by converting into a local tmezone.How can I do that?

Answer 1

The datetime.datetime.astimezone() method will return a datetime object with the same UTC time but in the local timezone. For your example times:

>>> dt_1 = datettime.fromisoformat(2021-06-25 15:00:08+00:00)
>>> dt_1.astimezone()
datetime.datetime(2021, 6, 25, 11, 0, 8, tzinfo=datetime.timezone(datetime.timedelta(days=-1, seconds=72000), 'EDT'))

>>> dt_2 = datetime.fromisoformat(2021-06-24 06:33:06-07:00)
>>> dt_2.astimezone()
datetime.datetime(2021, 6, 24, 9, 33, 6, tzinfo=datetime.timezone(datetime.timedelta(days=-1, seconds=72000), 'EDT'))

Since datetime.datetime objects with tzinfo are timezone-aware, the information will be stored in the objects regardless. This is just a handy way to get the local time.

UPDATE, based on a follow-up question below:

astimezone() doesn't depend on the way the datetime object is created. For differently formatted date/time strings, datetime.strptime can be used to create a timezone-aware datetime objects. From the example given in that follow-up question:

>>> dt_3 = datetime.strptime('Sat, 26 Jun 2021 15:00:09 +0000 (UTC)',
                             '%a, %d %b %Y %H:%M:%S %z (%Z)')
>>> dt_3.astimezone()
datetime.datetime(2021, 6, 26, 11, 0, 9, tzinfo=datetime.timezone(datetime.timedelta(days=-1, seconds=72000), 'EDT'))

Answer 2

You could use pytz library

from datetime import datetime
import pytz

dt_input = datetime.fromisoformat('2021-06-24 06:33:06-07:00')
print(dt_input) # prints datetime in input timezone

local_tz = pytz.timezone('Asia/Kolkata') #provide your timezone here
dt_local = dt_input.astimezone(local_tz)

print(dt_local) #prints in your local timezone as provided above

You can refer to this SO question similar to your question:

How to convert a UTC datetime to a local datetime using only standard library?

EDIT: Convert any string to datetime object:

You can use strptime('datestring', 'dateformat')

example from your comment:

#This will convert the string to datetime object    
datetime.strptime('Sat, 26 Jun 2021 15:00:09 +0000 (UTC)','%a, %d %b %Y %H:%M:%S %z (%Z)')

Once it is converted to datetime object you can convert it to your local timezone as mentioned above