> From: Martin Phillips
>
> The algorithm for ISO week numbers (which seems like a widely
> used standard) can be found at
> http://personal.ecu.edu/mccartyr/ISOwdALG.txt
I don't think I've ever given this even a moment's thought.
HPUX `man date` says it recognizes:
%U Week number of the year (Sunday as the first day of the
week) as a two-digit decimal number [00-53]. All days that
precede the first Sunday in the year are considered to be in
week 00.
%V Week number of the year (Monday as the first day of the
week) as a two-digit decimal number [01-53]. If the week
containing January 1 has four or more days in the new year
(January 1 is Thursday or sooner), it is designated as week
01; otherwise, (January 1 is Friday or later), it is
designated as the last week of the previous year, and the
next week is week 01.
%W Week number of the year (Monday as the first day of the
week) as a two-digit decimal number [00-53]. All days that
precede the first Monday in the year are considered to be in
week 00.
Looks like %V matches up with ISO, per MP's url:
ISO 8601 specifies that Week 01 of the year is the week containing
the first Thursday; Monday is Weekday 1, Sunday is Weekday 7;
WeekNumber requires two digits (W01, W02, etc.; "W" is optional)
Now I've given it a moment's thought.
cds
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