code: function(year, month) {
  			var date = this._validate(year, month, this.minDay, $.calendars.local.invalidMonth);
  			return this.daysPerMonth[date.month() - 1] +
  				(date.month() === 2 && this.leapYear(date.year()) ? 1 : 0);
  		}
docs: Retrieve the number of days in a month.
  @memberof TaiwanCalendar
  @param year {CDate|number} The date to examine or the year of the month.
  @param [month] {number} The month.
  @return {number} The number of days in this month.
  @throws Error if an invalid month/year or a different calendar used.