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> both The USA and Canada have been toying with the idea of dropping daylight savings time

Individual states are toying with the idea as well [1], which presents a problem if one of the tzdata locations decides to change its rules. You're screwed no matter what you choose to do. :-(

1: https://www.syracuse.com/state/2020/11/state-senator-introdu...

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It gets worse: DST in Indiana has to be handled on a per-county basis for anything prior to 2006.

https://en.m.wikipedia.org/wiki/Time_in_Indiana

It gets worse: from when I had to deal with this some years back IIRC in Saudi Arabia the start and end of DST is set by decree every year.

They already do. See Arizona.

…and then see Navajo reservation in there, and then see the Hopi reservation inside of that!

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