CODEWITHSUNDEEP
pythonlinuxpytz
user11862294
user11862294

Reputation:

Getting astimezone error in linux machine

I am using linux aws machine and there is a timezone difference when I do datetime.datetime.now. So I have tried this method to overcome the timezone error

format = "%Y-%m-%d %H:%M:%S %Z%z"
current_date = datetime.datetime.now()
now_asia = current_date.astimezone(timezone('Asia/Kolkata'))
print(now_asia.strftime(format))

when I do my window machine I didnt get any error. The same lines when I use in my linux machine I am getting "ValueError: astimezone() cannot be applied to a naive datetime"

To debug this I tried the methods which is mentioned in this link pytz and astimezone() cannot be applied to a naive datetime

when I tried the first answer I am not getting any error but the timezone is not converted. when I tried the second answer I am getting an error 'AttributeError: 'module' object has no attribute 'utcnow'

I tried this 

>>>loc_date = local_tz.localize(current_date)
>>> loc_date
datetime.datetime(2020, 4, 6, 7, 23, 36, 702645, tzinfo=<DstTzInfo 'Asia/Kolkata' IST+5:30:00 STD>)
>>> loc_date.strftime(format)
'2020-04-06 07:23:36 IST+05:30'

I am getting this ,so according to indian time if we add 5:30 it will be correct. How should i do it.

Upvotes: 3

Views: 583

Answers (1)

Kevin Languasco
Kevin Languasco

Reputation: 2426

Please check that you are indeed running the Python 3.7 interpreter in the cloud. Citing the documentation for the astimezone() function:

Changed in version 3.6: The astimezone() method can now be called on naive instances that are presumed to represent system local time.

Indeed, I just tested the script using Python 3.5.9 and pytz 2019.3 and I get

  File "timez.py", line 6, in <module>
    now_asia = current_date.astimezone(timezone('Asia/Kolkata'))
ValueError: astimezone() cannot be applied to a naive datetime

But when using Python 3.7.6 on an Amazon Linux 2 AMI instance, the code runs correctly.

Nevertheless, I would suggest to use timezone-aware datetimes from the start.

In the code you're referencing, you're getting that there's no utcnow attribute because that code imports from datetime import datetime, while you're doing import datetime. To make it work, you would use

now_utc = datetime.datetime.utcnow().replace(tzinfo=pytz.utc)

But note that the Python documentation now suggests you to use the tz parameter in datetime.now:

import datetime
import pytz

now_utc = datetime.datetime.now(tz=pytz.utc)
local_tz = pytz.timezone('Asia/Kolkata')
now_asia = now_utc.astimezone(local_tz)

format = "%Y-%m-%d %H:%M:%S %Z%z"
print(now_asia.strftime(format))

which prints 2020-04-22 09:25:21 IST+0530 in my case.

Upvotes: 2

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