StackOverflow #4829003: date diff testsuite

StackOverflow-4829003.js

// See http://stackoverflow.com/questions/4829003/using-date-in-js-to-calculate-the-difference-between-two-dates-what-am-i-doin

// jQuery mock object for calculateTime
// $('#time').html(result) => result is stored in $.result
var $ = (function() {
	var $, $$ = {
		html: function(result) {
			$.result = result
		}
	}
	return $ = function(ignore) {
		return $$
	}
})();

function calculateTime(todaysDate,futureDate) {
    var difference = futureDate.getTime() - todaysDate.getTime(); 

    var years = Math.floor(difference/1000/60/60/24/365);
        difference -= years*1000*60*60*24*365;

    var days = Math.floor(difference/1000/60/60/24);
        difference -= days*1000*60*60*24;

    var hours = Math.floor(difference/1000/60/60);
        difference -= hours*1000*60*60;

    var minutes = Math.floor(difference/1000/60);
        difference -= minutes*60*1000;

    var seconds = Math.floor(difference/1000);

    var result = years + ' Years, ';
        result += days + ' Days, ';
        result += hours + ' Hours, ';
        result += minutes + ' Minutes, ';
        result += seconds + ' Seconds';

    return $('#time').html(result)
}

function test(a, b, expected) {
	var toString = Object.prototype.toString;
	if (toString.apply(a) != '[object Date]') a = new Date(a);
	if (toString.apply(b) != '[object Date]') b = new Date(b);
	calculateTime(a, b);
	var got = $.result;
	WScript.Echo(
		got === expected
		? "ok"
		: "not ok - ["+a.toString()+"] to ["+b.toString()+"]\r\n#      Got: "+got+"\r\n# Expected: "+expected
	);
}

test('2010/11/24 23:00:00', '2011/11/24 23:00:00', '1 Years, 0 Days, 0 Hours, 0 Minutes, 0 Seconds');
test('Nov 24, 2010 23:00:00', 'Nov 24, 2011 23:00:00', '1 Years, 0 Days, 0 Hours, 0 Minutes, 0 Seconds');
test('2010/11/24 23:00:00', '2020/11/24 22:59:00', '10 Years, 0 Days, 0 Hours, 0 Minutes, 0 Seconds');
test('2011/03/26 23:00:00', '2011/03/27 23:00:00', '0 Years, 1 Days, 0 Hours, 0 Minutes, 0 Seconds');
test('2010/10/30 23:00:00', '2010/10/31 23:00:00', '0 Years, 1 Days, 0 Hours, 0 Minutes, 0 Seconds');