<?php $monthOptions = ''; $dayOptions = ''; $yearOptions = ''; for($month=1; $month<=12; $month++) { $monthName = date("M", mktime(0, 0, 0, $month)); $monthOptions .= "<option value=\"{$month}\">{$monthName}</option>\n"; } for($day=1; $day<=31; $day++) { $dayOptions .= "<option value=\"{$day}\">{$day}</option>\n"; } for($year=2011; $year>=1950; $year--) { $yearOptions .= "<option value=\"{$year}\">{$year}</option>\n"; } ?> <html> <head> <script type="text/javascript"> function updateDays() { //Create variables needed var monthSel = document.getElementById('month'); var daySel = document.getElementById('day'); var yearSel = document.getElementById('year'); var monthVal = monthSel.value; var yearVal = yearSel.value; //Determine the number of days in the month/year var daysInMonth = 31; if (monthVal==2) { daysInMonth = (yearVal%4==0 && (yearVal%100!=0 || yearVal%400==0)) ? 29 : 28; } else if (monthVal==4 || monthVal==6 || monthVal==9 || monthVal==11) { daysInMonth = 30; } //Add/remove options from days select list as needed if(daySel.options.length > daysInMonth) { //Remove excess days, if needed daySel.options.length = daysInMonth; } while (daySel.options.length != daysInMonth) { //Add additional days, if needed daySel.options[daySel.length] = new Option(daySel.length+1, daySel.length+1, false); } return; } </script> </head> </html>
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