Mostly for Mark:
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 )
is there any reason you wrote a function rather then used one? aside
from one more module that would need to be included?
for anyone researching this, for perl, its DateTime.pm:
use DateTime;
use Time::Local;
my $day,$mon,$yr,$julian;
(undef,undef,undef,$day,$mon,$yr) =
localtime($julian);
$yr += 1900;
$mon += 1;
print ("year $yr, mon: $mon, day, $day\n");
$my dt = DateTime->new(
year => $yr,
day => $day,
month => $mon,
)
print ($dt->week_number);
for php, its built in date();
print date('W',$julian);
and, mysql is
select WEEK(from_unixtime(julian),3);
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