code: function (/*Date*/dateObject) {
                  //	summary:
                  //		Returns the number of days in the month used by dateObject
                  var month = dateObject.getMonth();
                  var days = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
                  if (month === 1 && date.isLeapYear(dateObject)) {
                      return 29;
                  } // Number
                  return days[month]; // Number
              }
docs: @lends date 
  Returns the number of days in the month of a date
  
  @example
  
  dateExtender.getDaysInMonth(new Date(2006, 1, 1)); //28
  dateExtender.getDaysInMonth(new Date(2004, 1, 1)); //29
  dateExtender.getDaysInMonth(new Date(2006, 2, 1)); //31
  dateExtender.getDaysInMonth(new Date(2006, 3, 1)); //30
  dateExtender.getDaysInMonth(new Date(2006, 4, 1)); //31
  dateExtender.getDaysInMonth(new Date(2006, 5, 1)); //30
  dateExtender.getDaysInMonth(new Date(2006, 6, 1)); //31
  @param {Date} dateObject the date containing the month
  @return {Number} the number of days in the month