Whenever – typed and DST-safe datetimes for Python

Re:Whenever – typed and DST-safe datetimes for Python by EdwardDiego on Sunday April 13, 2025 @07:28AM (#43671977)

There are so many footguns in the datetime lib.

That's why I use a Flake8 plugin to prohibit especially egregious footguns.

https://github.com/jkittner/flake8-ban-utcnow

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Re:Whenever – typed and DST-safe datetimes for Python by raverbashing on Sunday April 13, 2025 @09:17AM (#43672600)

Honestly yeah who in tarnation created that function and called it utcnow

These things are really frustrating

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Re:Whenever – typed and DST-safe datetimes for Python by mark-r on Sunday April 13, 2025 @10:15AM (#43672964)

Yeah, utcnow is completely broken. They should have fixed it when they created datetime.timezone.utc, but they didn't. The recommendation is to use datetime.datetime.now(datetime.timezone.utc) instead. utcnow should be deprecated and eventually removed.

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Re:Whenever – typed and DST-safe datetimes for Python by jessekv on Sunday April 13, 2025 @10:45AM (#43673167)

I recently learned that there is datetime.UTC which is an alias of datetime.timezone.utc

It helps a bit with the verbosity:

from datetime import datetime, UTC

datetime.now(UTC)

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Re:Whenever – typed and DST-safe datetimes for Python by maleldil on Sunday April 13, 2025 @11:34AM (#43673535)

That's from 3.11 onwards.

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