[removed] calculate number of days in month for a given year

Question

I have a HTML page with 3 dropdowns for the month, day and year and I was wondering if there was a way to populate the month drop down properly depending on the month and ye

Answer 1

Date.prototype.daysinMonth: function(){
    var d= new Date(this.getFullYear(), this.getMonth()+1, 0);
    return d.getDate();
}

function daysinMonthfromInput(month,year){
    return (new Date(year,month-1,1)).daysinMonth();
}

alert(daysinMonthfromInput(2,2011));