Nicholas Bodley scripsit:

> One needs to consider with some care how to define the first
> week of a year, btw. IIrc, if it contains a Thursday, it is
> the first week, but that implies that the first day of a week
> would be Monday.

ISO weeks do indeed begin on Monday.

> (Then, would a week in which 1 Jan. is
> Friday be part of the preceding year, by this scheme? I guess
> so; I don't know.)

Just so. An equivalent way to put it is that W1 is the week
containing January 4.

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