Weeks in a year is 52 or 53 Days in a year is 365 and if a leap year 366 If ( (365 (Days Of a year) * (Years From 1940)) + (Number of leap years since 1940, (Years From 1940 / 4) (if its a Leap year -1)) + ((Days >From 01-01) + 1) % 7 = (0-6 where 0 = Monday) ) is less then 3 (Thursday) then its in week nr 01 else if equal to 4 (Friday) its week 53 else its week 52 http://threesides.kronan-net.com/2008/08/04/date-calculation-algorithm/ -- MvH / Hans Åhlin - www.kronan-net.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php