[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

I am using this approach in my current project and found that I needed correct for round off errors. So instead of using monthLength in my code, I had to use this instead:

monthLength.toFixed(0)

For example if I have an object in which I am storing a text date field, it may look like this:

obj.month = theMonths[mm - 1] + " " + monthLength.toFixed(0) + ", " + obj.year;

Answer 2

Copy from another post: Get number days in a specified month using javascript?

//Month is 1 based
function daysInMonth(month,year) {
return new Date(year, month, 0).getDate();
}

//July
daysInMonth(7,2009); //31
//February
daysInMonth(2,2009); //28
daysInMonth(2,2008); //29

All the credits to @c_harm, really great solution