src/components/datepicker/js/dateUtil.js
function getWeekOfMonth(date) {
      var firstDayOfMonth = getFirstDateOfMonth(date);
      return Math.floor((firstDayOfMonth.getDay() + date.getDate() - 1) / 7);
    }
function getWeekOfMonth(date) {
      var firstDayOfMonth = getFirstDateOfMonth(date);
      return Math.floor((firstDayOfMonth.getDay() + date.getDate() - 1) / 7);
    }
function getWeekOfMonth ( date ) { var firstDayOfMonth = getFirstDateOfMonth ( date ) ; return Math . floor ( ( firstDayOfMonth . getDay ( ) + date . getDate ( ) - 1 ) / 7 ) ; }
Gets the week of the month that a given date occurs in.
@param {Date} date
@returns {number} Index of the week of the month (zero-based).
Gets the week of the month that a given date occurs in .