code: function skipHiddenDays(date, inc, isExclusive) {
  		inc = inc || 1;
  		while (
  			isHiddenDayHash[ ( date.getDay() + (isExclusive ? inc : 0) + 7 ) % 7 ]
  		) {
  			addDays(date, inc);
  		}
  	}
docs: Keep incrementing the current day until it is no longer a hidden day. If the initial value of `date` is not a hidden day, don't do anything. Pass `isExclusive` as `true` if you are dealing with an end date. `inc` defaults to `1` (increment one day forward each time)