Michael,
> I am looking for perl, php and mysql functions to produce the exact same
> iso week number (yes, there are 7 modes of this, based on my research)
>
> the custom iso_week() function seems to be the same if not exactly the
> same as mysql WEEK(time,3) (mode 3), and for that matter, the same as
> DateTime.pm.
> (first week of year is first week with a thursday in it, or, first week,
> starting on monday with 4 or more days..., so dec 28, 2008 is year 2008,
> week 52, jan 1, 2009 is year 2008, week 52 )
Yes, it is indeed equivalent to MySQL week(date,3), as documented in the code:
# Given a Unix numeric time (seconds since 1970-01-01T00:00Z),
# provide a week number 1..53 (local time) as specified in ISO 8601 (EN 28601)
# ( equivalent to PostgreSQL extract(week from ...), and MySQL week(date,3) )
#
sub iso8601_week($) { ... }
> is there any reason you wrote a function rather then used one? aside
> from one more module that would need to be included?
Yes, that was the main reason - avoiding yet another dependency,
and in this case, quite a heavy-weight one.
Mark
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