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osiemens | karma 17 | avg karma 2.83 · 2013-01-02 20:42:47+00:00

It's a not entirely uncommon bug having to do with the naming of the first week of the year. Perhaps it's even as deep as NSCalendar, but I can't check that right now. ref: http://stackoverflow.com/questions/1106943/nscalendar-first-...

VMG | karma 8688 | avg karma 3.0 · 2013-01-02 21:04:20+00:00

Oh yes. The ISO definition is pretty straightforward: «The first week of a year is the week that contains the first Thursday of the year.» (http://en.wikipedia.org/wiki/ISO_week_date)

Actual implementations often look more like this: http://www.epoch-calendar.com/support/getting_iso_week.html

Implementing it as a one-liner would be an interesting code golf exercise.

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