Get week of the month

Question

How can i get the week number of month using javascript / jquery?

For ex.:

First Week: 5th July, 2010. / Week Number = First monday

Answer 1

function getWeekOfMonth(date) {

  var nth = 0; // returning variable.
  var timestamp = date.getTime(); // get UTC timestamp of date.
  var month = date.getMonth(); // get current month.
  var m = month; // save temp value of month.

  while( m == month ) {  // check if m equals our date's month.
    nth++; // increment our week count.
    // update m to reflect previous week (previous to last value of m).
    m = new Date(timestamp - nth * 604800000).getMonth();
  }

  return nth;

}