A tiny New Year's programming challenge

[Dieter]

(01-02-2015 10:29 AM)Gerald H Wrote:  While on this topic, why oh why didn't ISO count from 0 to 11 & 0 to 6?

I think it's simply because humans usually start counting at 1, not 0. The week is an ordinal number, so the first week is week 1, just as the third day in a week is day 3. I suppose it wouldn't be very helpful if the fifth day of week twenty would be described as week 19, day 4. ;-)

Dieter