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January 1st is not always on the first week of the year
(www.jpvalencia.com)
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this post was submitted on 24 Mar 2026
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That video is a classic. It's exactly why I put "it has nothing to do with timezones" as subtitle for the post :) That was my first guess when I encountered the bug, before I realized it was about the ISO weeks.
And in the end of the post I also added a list of falsehoods, different from your link tho: https://gist.github.com/timvisee/fcda9bbdff88d45cc9061606b4b923ca