code: function(inst, offset, curYear, curMonth) {
  		var numMonths = this._getNumberOfMonths(inst);
  		var date = this._daylightSavingAdjust(new Date(curYear,
  			curMonth + (offset < 0 ? offset : numMonths[0] * numMonths[1]), 1));
  		if (offset < 0)
  			date.setDate(this._getDaysInMonth(date.getFullYear(), date.getMonth()));
  		return this._isInRange(inst, date);
  	}
docs: /* Determines if we should allow a "next/prev" month display change.