https://nomadradio.co.uk/js/jquery.countdown.js

1(function($) {
2	$.fn.countdown = function(options, callback) {
3
4		//custom 'this' selector
5		thisEl = $(this);
6
7		//array of custom settings
8		var settings = { 
9			'date': null,
10			'format': null
11		};
12
13		//append the settings array to options
14		if(options) {
15			$.extend(settings, options);
16		}
17		
18		//main countdown function
19		function countdown_proc() {
20			
21			eventDate = Date.parse(settings['date']) / 1000;
22			currentDate = Math.floor($.now() / 1000);
23			
24			if(eventDate <= currentDate) {
25				callback.call(this);
26				clearInterval(interval);
27			}
28			
29			seconds = eventDate - currentDate;
30			
31			days = Math.floor(seconds / (60 * 60 * 24)); //calculate the number of days
32			seconds -= days * 60 * 60 * 24; //update the seconds variable with no. of days removed
33			
34			hours = Math.floor(seconds / (60 * 60));
35			seconds -= hours * 60 * 60; //update the seconds variable with no. of hours removed
36			
37			minutes = Math.floor(seconds / 60);
38			seconds -= minutes * 60; //update the seconds variable with no. of minutes removed
39			
40			//conditional Ss
41			if (days == 1) { thisEl.find(".timeRefDays").text("day"); } else { thisEl.find(".timeRefDays").text("days"); }
42			if (hours == 1) { thisEl.find(".timeRefHours").text("hour"); } else { thisEl.find(".timeRefHours").text("hours"); }
43			if (minutes == 1) { thisEl.find(".timeRefMinutes").text("minute"); } else { thisEl.find(".timeRefMinutes").text("minutes"); }
44			if (seconds == 1) { thisEl.find(".timeRefSeconds").text("second"); } else { thisEl.find(".timeRefSeconds").text("seconds"); }
45			
46			//logic for the two_digits ON setting
47			if(settings['format'] == "on") {
48				days = (String(days).length >= 2) ? days : "0" + days;
49				hours = (String(hours).length >= 2) ? hours : "0" + hours;
50				minutes = (String(minutes).length >= 2) ? minutes : "0" + minutes;
51				seconds = (String(seconds).length >= 2) ? seconds : "0" + seconds;
52			}
53			
54			//update the countdown's html values.
55			if(!isNaN(eventDate)) {
56				thisEl.find(".days").text(days);
57				thisEl.find(".hours").text(hours);
58				thisEl.find(".minutes").text(minutes);
59				thisEl.find(".seconds").text(seconds);
60			} else { 
61				alert("Invalid date. Here's an example: 12 Tuesday 2012 17:30:00");
62				clearInterval(interval); 
63			}
64		}
65		
66		//run the function
67		countdown_proc();
68		
69		//loop the function
70		interval = setInterval(countdown_proc, 1000);
71		
72	}
73}) (jQuery);