JS: Disable next X working days & weekends

gistfile1.js

/**
 * JS: Disable next X working days & weekends
 * This disables selection of the next X working days in the jQuery datepicker
 * along with weekends using the built in function
 *
 * 14/03/2012 - Oli Mortimer (olimortimer.com)
 * Originally posted on StackOverflow by Junto (benpowell.co.uk)
 *
 * Usage: Change the required number of days in AddWeekDays(X)
 **/

	var dateMin = new Date();
	var weekDays = AddWeekDays(3);

	dateMin.setDate(dateMin.getDate() + weekDays);

	function AddWeekDays(weekDaysToAdd) {
		var daysToAdd = 0
		var mydate = new Date()
		var day = mydate.getDay()
		weekDaysToAdd = weekDaysToAdd - (5 - day)
		if ((5 - day) < weekDaysToAdd || weekDaysToAdd == 1) {
			daysToAdd = (5 - day) + 2 + daysToAdd
		} else { // (5-day) >= weekDaysToAdd
			daysToAdd = (5 - day) + daysToAdd
		}
		while (weekDaysToAdd != 0) {
			var week = weekDaysToAdd - 5
			if (week > 0) {
				daysToAdd = 7 + daysToAdd
				weekDaysToAdd = weekDaysToAdd - 5
			} else { // week < 0
				daysToAdd = (5 + week) + daysToAdd
				weekDaysToAdd = weekDaysToAdd - (5 + week)
			}
		}

		return daysToAdd;
	}

	$('#datepicker').datepicker({
		beforeShowDay: $.datepicker.noWeekends, // disable weekends
		minDate: dateMin
	});