get number of sundays in a month using javascript [duplicate]

Answer 1

https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Date

function sundays(year, month) {

    var day, counter, date;

    day = 1;
    counter = 0;
    date = new Date(year, month, day);
    while (date.getMonth() === month) {
        if (date.getDay() === 0) { // Sun=0, Mon=1, Tue=2, etc.
            counter += 1;
        }
        day += 1;
        date = new Date(year, month, day);
    }
    return counter;
}

console.log(sundays(2012, 5));