date("t")

I know I can get the number of days in the current month with date("t"), but how would I go about getting the number of days in a different month? I have a form that allows users to insert a date. If the value they put in doesn't exist (February 31, 2001, for example), I want to override it. I'm already using checkdate to determine if a date is bad, but I'm a bit stumped on using date("t") to set a valid maximum for the month the user submits. (I've set up the form so that users will always submit a valid month, but the day is my one loose end.) Here's my code, if you'd like to make suggestions: $ver_date = checkdate($date_month, $date_day, $date_year); if ($ver_date) { $safedate = $date_year."-".$date_month."-".$date_day; } else { //reset their date_day somehow } Thanks for any suggestions, Maurice -- Maurice Rickard http://mauricerickard.com/