code: function(year, month, day) {
  			this._validate(year, month, day, $.calendars.local.invalidDate);
  			return 0;
  		}
docs: Determine the week of the year for a date.
  @memberof MayanCalendar
  @param year {CDate|number} The date to examine or the year to examine.
  @param [month] {number} The month to examine.
  @param [day] {number} The day to examine.
  @return {number} The week of the year.
  @throws Error if an invalid date or a different calendar used.