code: function extractOtherDate(elem, source, noOther) {
  			if (source.newDate && source.extraInfo) { // Already a CDate
  				return [source];
  			}
  			var inst = $.calendarsPicker._getInst(elem);
  			var thatDate = null;
  			try {
  				if (typeof source === 'string' && source !== 'today') {
  					thatDate = inst.options.calendar.parseDate(inst.get('dateFormat'), source);
  				}
  			}
  			catch (e) {
  				// Ignore
  			}
  			thatDate = (thatDate ? [thatDate] : (source === 'today' ?
  				[inst.options.calendar.today()] : (noOther ? [] : $(source).calendarsPicker('getDate'))));
  			return thatDate;
  		}
docs: Determine the comparison date.
  @param elem {Element} The current datepicker element.
  @param source {string|CDate|jQueryElement} The source of the other date.
  @param noOther {boolean} <code>true</code> to not get the date from another field.
  @return {CDate[]} The date for comparison.