Witam!
Znalazłem w sieci skrypt, który odlicza czas do jakiegoś wydarzenia. Szukałem prostego skryptu i mi się to udało, ale niestety pod dojechaniu do 0 skrypt leci dalej i nie wywołuje się akcja tak jak powinno być.

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<script type="text/javascript">
		$('#example').countdown({
			date: '<?php echo $next_game_time_counter;?>',			
			day: 'Day',
			days: 'Days'
		}, function () {
			alert('Done!');
		});
</script>
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i plik js

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/* CountDown Clock v1.0.0.0 - <a href="https://github.com/e-piksel/countdown" target="_blank">https://github.com/e-piksel/countdown</a> */
(function ($) {
	$.fn.countdown = function (options, callback) {
		var settings = $.extend({
			date: null,
			offset: null,
			day: 'Day',
			days: 'Days',
			hour: 'Hour',
			hours: 'Hours',
			minute: 'Minute',
			minutes: 'Minutes',
			second: 'Second',
			seconds: 'Seconds'
		}, options);
 
		// Throw error if date is not set
		if (!settings.date) {
			$.error('Date is not defined.');
		}
 
		// Throw error if date is set incorectly
		if (!Date.parse(settings.date)) {
			$.error('Incorrect date format, it should look like this, 12/24/2012 12:00:00.');
		}
 
		// Save container
		var container = this;
 
		/**
		 * Change client's local date to match offset timezone
		 * @return {Object} Fixed Date object.
		 */
		var currentDate = function () {
			// get client's current date
			var date = new Date();
 
			// turn date to utc
			var utc = date.getTime() + (date.getTimezoneOffset() * 60000);
 
			// set new Date object
			var new_date = new Date(utc + (3600000*settings.offset))
 
			return new_date;
		};
 
		/**
		 * Main countdown function that calculates everything
		 */
		function countdown () {
			var target_date = new Date(settings.date), // set target date
				current_date = currentDate(); // get fixed current date
 
			// difference of dates
			var difference = target_date - current_date;
 
			// if difference is negative than it's pass the target date
			if (difference < 0) {
				// stop timer
				clearInterval(interval);
 
				if (callback && typeof callback === 'function') callback();
 
				return;
			}
 
			// basic math variables
			var _second = 1000,
				_minute = _second * 60,
				_hour = _minute * 60,
				_day = _hour * 24;
 
			// calculate dates
			var days = Math.floor(difference / _day),
				hours = Math.floor((difference % _day) / _hour),
				minutes = Math.floor((difference % _hour) / _minute),
				seconds = Math.floor((difference % _minute) / _second);
 
				// fix dates so that it will show two digets
				days = (String(days).length >= 2) ? days : '0' + days;
				hours = (String(hours).length >= 2) ? hours : '0' + hours;
				minutes = (String(minutes).length >= 2) ? minutes : '0' + minutes;
				seconds = (String(seconds).length >= 2) ? seconds : '0' + seconds;
 
			// based on the date change the refrence wording
			var text_days = (days === 1) ? settings.day : settings.days,
				text_hours = (hours === 1) ? settings.hour : settings.hours,
				text_minutes = (minutes === 1) ? settings.minute : settings.minutes,
				text_seconds = (seconds === 1) ? settings.second : settings.seconds;
 
			// set to DOM
			container.find('.days').text(days);
			container.find('.hours').text(hours);
			container.find('.minutes').text(minutes);
			container.find('.seconds').text(seconds);
 
			container.find('.days_text').text(text_days);
			container.find('.hours_text').text(text_hours);
			container.find('.minutes_text').text(text_minutes);
			container.find('.seconds_text').text(text_seconds);
		};
 
		// start
		var interval = setInterval(countdown, 1000);
	};
 
})(jQuery);
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Dokumentacji niestety nie ma i nie potrafię sobie z tym problemem poradzić.

dodaj warunek sprawdzający i zatrzymaj setInterval funkcja clearInterval

A czy ten kod nie jest za to odpowiedzialny? A raczej powinien być?

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// difference of dates
			var difference = target_date - current_date;
 
			// if difference is negative than it's pass the target date
			if (difference < 0) {
				// stop timer
				clearInterval(interval);
 
				if (callback && typeof callback === 'function') callback();
 
				return;
			}
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