code: function(year, month) {
  			if (year.year) {
  				month = year.month();
  				year = year.year();
  			}
  			this._validate(year, month, this.minDay, $.calendars.local.invalidMonth);
  			return (typeof this.NEPALI_CALENDAR_DATA[year] === 'undefined' ?
  				this.daysPerMonth[month - 1] : this.NEPALI_CALENDAR_DATA[year][month]);
  		}
docs: Retrieve the number of days in a month.
  @memberof NepaliCalendar
  @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.