code: function (year, month, day) {
  			var date = this._validate(year, month, day, $.calendars.local.invalidDate);
  			var index = (12 * (date.year() - 1)) + date.month() - 15292;
  			var mcjdn = date.day() + ummalqura_dat[index - 1] - 1;
  			return mcjdn + 2400000 - 0.5; // Modified Chronological Julian Day Number (MCJDN)
  		}
docs: Retrieve the Julian date equivalent for this date,
  i.e. days since January 1, 4713 BCE Greenwich noon.
  @memberof UmmAlQuraCalendar
  @param year {CDate|number} The date to convert or the year to convert.
  @param [month] {number} The month to convert.
  @param [day] {number} The day to convert.
  @return {number} The equivalent Julian date.
  @throws Error if an invalid date or a different calendar used.