note 39150 deleted from function.cal-days-in-month by didou

Note Submitter: ben@sparkyb.net ---- I was checking your math, and it doesn't work out right. The mod 7, mod 2 thing is genius (I too know the knuckles thing) but you are off by 1. remember that modulus wraps around to 0 whereas the months start counting with 1. The fix is to subtract 1 so that you count from 0. The revised function: function days_in_month($month, $year) { // calculate number of days in a month return $month == 2 ? ($year % 4 ? 28 : ($year % 100 ? 29 : ($year % 400 ? 28 : 29))) : (($month - 1) % 7 % 2 ? 30 : 31); }