Paul Ganssle <p.gans...@gmail.com> added the comment:

I do think this is an active bug in OpenBSD's ISO calculations, here: 
https://github.com/openbsd/src/blob/b66614995ab119f75167daaa7755b34001836821/lib/libc/time/wcsftime.c#L326

I re-created this algorithm in Python and at the beginning of the year it gives 
the wrong answer at the beginning of the year in about 50% of years. I have 
spent some time trying to understand the way the algorithm is *supposed* to 
work, but I don't totally understand what it's doing. I'll report this to 
OpenBSD.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue31635>
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