utcnow is deprecated in python 3.12

[kasium]

Environment details

• OS: Linux
• Python version: 3.12.0
• pip version: 23.2.1
• google-auth version: 2.9.1

Issue

Here is the related code

https://github.com/googleapis/google-auth-library-python/blob/d2ab3afdb567850121fec7de1d86fb5fb0fa80ed/google/auth/_helpers.py#L89-L95

[arithmetic1728]

this can be fixed by replacing datetime.datetime.utcnow() with datetime.datetime.now(datetime.timezone.utc), see

https://docs.python.org/3.12/library/datetime.html#datetime.datetime.utcnow

[arithmetic1728]

it looks like we cannot simply replace datetime.datetime.utcnow() with datetime.datetime.now(datetime.timezone.utc), since utcnow is offset-naive (no timezone) but now is offset-aware (has timezone). It's very common to compare the token expiry in auth lib itself as well as gcloud, if we simply switch the type, the comparison fails.

[kasium]

I guess you can then just remove the tzinfo afterwards like ".replace(tzinfo=None)"

[arithmetic1728]

@kasium yep, that sounds like the only way. Thanks!