code: function(year) {
  			var date = this._validate(year, this.minMonth, this.minDay,
  				$.calendars.local.invalidYear || $.calendars.regionalOptions[''].invalidYear);
  			return (date.year() < 0 ? this.local.epochs[0] : this.local.epochs[1]);
  		}
docs: Retrieve the epoch designator for this date.
  @memberof BaseCalendar
  @param year {CDate|number} The date to examine or the year to examine.
  @return {string} The current epoch.
  @throws Error if an invalid year or a different calendar used.