Convert a datetime object to UTC without using pytz#

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from datetime import timezone
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import git
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repo = git.Repo(".", odbt=git.GitDB)
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commit = list(repo.iter_commits(ref))[0]
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dt = commit.committed_datetime
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# This was 2020-04-19T07:55:08-07:00
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dt_in_utc = dt.astimezone(timezone.utc)
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# Now use .isoformat() to convert to a string
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print(dt_in_utc.isoformat())
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# Came out as 2020-04-19T14:55:08+00:00