dms
910
52wk + 1 or 2 days in a year. + if Jan 1 is not on a Monday, week 2 starts before Jan 8, etc ... until a week 53 (maybe incomplete) at the end of the year. [nt]
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Patek follows ISO 8601, according to which weeks start on Monday. Therefore, Week 1 of a year is considered the one that contains the first *Thursday* of that year...
This is because by containing the first Thursday, Week 1 is the first to also contain a majority (i.e, at least 4 out of 7) of its days inside the new year. Given this, the rest of the weekly calendar is uniquely determined; in particular, every year will...
