this post was submitted on 12 Apr 2024
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What does tz_database do? Wikipedia makes it seem like it basically converts a pair (geocoordinatr, utc time) to local time
From my very basic understanding, yeah that's basically what it does. However it accounts for a whole lot more into adding or subtracting from UTC. Timezones aren't absolute, they're political. Timezones have weird rules, and history that needs to be somehow expressed in the code to get the right time. That's what's sets tz_database apart from just looking at a map and saying it's +7 UTC.
So it updates now and then with new rules, and it keeps historical rules for past dates?
I think so. Like I said, I have a very basic understanding of it. There are definitely a lot of people who know more about this than I do.