date functions

Yo! I'm currently working in a calendar and I've run into problems. I use this code to create a <select> tag with 12 <option> tags, one for each month. $month = 1; while ($month <= 12) { echo "<option value=" . date("F", mktime(0, 0, 0, $month, 1, 2000)).">".date("F", mktime(0, 0, 0, $month, 1, 2000)); ++$month; } this works fine, but now I want to list all the days in a certain month, and I don't know how to achieve that. I can't use a while statement as with the months, because I don't know how many days it will be in a certain month, (I know that it will allways be 12 months though) so how can I do this? Any help much appreciated!! /Broder