Angular directive and service that validates that a particular date is on the third Friday of the month

must-be-third-friday

angular.module("theModuleName").directive("mustBeThirdFriday", function(timeService)
{
	return {
		require: "ngModel",
		link: function(scope, element, attrs, ngModel)
		{
			ngModel.$validators.mustBeThirdFriday = function(modelValue)
			{
				return timeService.isThirdFriday(new Date(modelValue + " 0:00"));
			};
		}
	};
});

(function()
{
	"use strict";
	angular.module("theModuleName").factory("timeService", timeService);

	timeService.$inject = [];

	function timeService()
	{
		var service = {
			getThirdFriday: getThirdFriday,
			isDst: isDst,
			isExchangeOpen: isExchangeOpen,
			isThirdFriday: isThirdFriday
		};

		return service;

		function getThirdFriday(year, month)
		{
			var thirdFriday = new Date(year, month, 1);
			thirdFriday.setDate(thirdFriday.getDate() + (12 - thirdFriday.getDay()) % 7);
			thirdFriday.setDate(thirdFriday.getDate() + 14);
			return thirdFriday;
		}

		function isDst()
		{
			var now = new Date();
			var year = now.getYear();
			var secondSundayInMarch = new Date(year, 2, 7);
			secondSundayInMarch.setDate(7 + (7 - secondSundayInMarch.getDay()));
			var firstSundayInNovember = new Date(year, 10, 7);
    			firstSundayInNovember.setDate(7 - firstSundayInNovember.getDay());
    			return (now <= firstSundayInNovember && now >= secondSundayInMarch);
		}

		function isExchangeOpen()
		{
			var now = new Date();
			var inDst = isDst();
			var open, close;
			if (inDst)
			{
				open = new Date();
				open.setHours(6);
				open.setMinutes(30);
				close = new Date();
				close.setHours(13);
				close.setMinutes(0);
				return (now > open && now < close);
			}
			else
			{
				open = new Date();
				open.setHours(7);
				open.setMinutes(30);
				close = new Date();
				close.setHours(14);
				close.setMinutes(0);
				return (now > open && now < close);
			}
		}

		function isThirdFriday(dateInQuestion)
		{
			if (dateInQuestion instanceof Date)
			{
				var thirdFriday = getThirdFriday(dateInQuestion.getFullYear(), dateInQuestion.getMonth());
				return (dateInQuestion.getDate() === thirdFriday.getDate());
			}
			return false;
		}
	}
})();