function daysInMonth(month,year) {
var m = [31,28,31,30,31,30,31,31,30,31,30,31];
if (month != 2) return m[month - 1];
if (year%4 != 0) return m[1];
if (year%100 == 0 && year%400 != 0) return m[1];
return m[1] + 1;
}