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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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Programming
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Fuck, I just wrote an app to help HR process data and I had to, without using Ai, define the first week of the year to match that ISO spec. Week 53 was a fun one but I now have to cover two weeks with the same number.
Yep, but the year of week will be different for each.
Use a date library. Life is too short to make your own. The new Temporal library in JavaScript is quite good.
It's written in C++ lol