Get number days in specified month

my_daysinmonth.js

// ref: http://stackoverflow.com/questions/1184334/get-number-days-in-a-specified-month-using-javascript
// ref: http://stackoverflow.com/questions/16353211/check-if-year-is-leap-year-in-javascript

function daysInMonth(year, month) {
	var isLeapYeaer = new Date(year, 1, 29).getMonth() == 1;
	return [31, (isLeapYeaer ? 29 : 28), 31, 30, 31, 30, 31, 31, 30, 31, 30, 31][month];
}