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This thread is making me panic that I don't understand handling time in programming and now I am paranoid that one day it will bite me hard.

What is a good primer in understanding most of the serious issues raised in this thread and how they manifest themselves in (preferably) languages like Python?

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Read the luxon.js docs (the timezone section.) It’s the successor to moment.js. They do a great job explaining the common footguns developers face.

Interesting, some of us migrated to date fns since

If you read GitHub issues for datefns you’ll find examples where it doesn’t handle timezones correctly

This is for .NET, but the issues described stand for any stack:

https://codeblog.jonskeet.uk/2019/03/27/storing-utc-is-not-a...

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