Home/ Questions/Steps to fix the error “can't subtract offset-naive and offset-aware datetimes”
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Winston O'Brien
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Asked: 2022-05-17T14:26:07+00:00 In:

Steps to fix the error “can’t subtract offset-naive and offset-aware datetimes”

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I’m trying to run a new project. I do a couple of things like this:

NOW() AT TIME ZONE 'UTC'

But in my program, I am getting the warning:

TypeError: can't subtract offset-naive and offset-aware datetimes

Can someone explain why the “can’t subtract offset-naive and offset-aware datetimes” issue happened? Where have I gone wrong? Thank you!

can't subtract offset-naive
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2 Answers

  1. Best Answer
    Expert

    The cause: Other timezones are frequently confused with each other (GMT, Greenwich, Universal, etc.). The definition of UTC differs from those of the other time zones, and they are not interchangeable. As a result, they won’t be able to compare the two in Python. Incompatibility is the cause of the problem

    Solution: Remove the timezone awareness and replace it with time zone conversion to prevent the

    error “can’t subtract offset-naive and offset-aware datetimes”.

    naive = dt.replace(tzinfo=None)
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  2. The best solution is to Add the Timezone Info, e.g. to get the current hour as an aware Datetime object in Python 3 

    from datetime import datetime, timezone

now = datetime.now(timezone.utc)

    You can define utc.tzinfo objects in older Python versions (example: datetime docs). 

    from datetime import tzinfo, timedelta, datetime

ZERO = timedelta(0)

class UTC(tzinfo):
 def utcoffset(self, dt):
 return ZERO
 def tzname(self, dt):
 return "UTC"
 def dst(self, dt):
 return ZERO

utc = UTC()

    then: 

    now = datetime.now(utc)
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