Convert a datetime object to UTC without using pytz

I wanted to convert a datetime object (from GitPython) to UTC without adding the pytz dependency.

from datetime import timezone
import git

repo = git.Repo(".", odbt=git.GitDB)
commit = list(repo.iter_commits(ref))[0]
dt = commit.committed_datetime
# This was 2020-04-19T07:55:08-07:00
dt_in_utc = dt.astimezone(timezone.utc)

# Now use .isoformat() to convert to a string
# Came out as 2020-04-19T14:55:08+00:00

Created 2020-04-19T09:02:23-07:00 · Edit