A sweet js countdown timer with a custom callback that gives you a JSON object!

jsTimer-test.js

timer('2011-12-31', function(timeRemaining) {
	console.log('Timer 1:', timeRemaining);
});

// This will run every minute, instead of every second
timer('2012-12-31', function(timeRemaining) {
	console.log('Timer 2:', timeRemaining);
}, 60000);

jsTimer.js

/**
 * A sweet js countdown timer with a custom callback that gives you a JSON object!
 * Heavily modified code originally found on http://www.ricocheting.com/code/javascript/html-generator/countdown-timer
 *
 * @param string|Date String representation of when to countdown to. Date objects probably work too
 * @param callback Function triggered when the interval has passed
 * @param int Number of milliseconds for the timeout. Defaults to 1000 (1 second)
 *
 * @return object Returns a JSON object with properties: days, hours, minutes, seconds
 */
timer = function(endDate, callback, interval) {
    endDate = new Date(endDate);
    interval = interval || 1000;

    var currentDate = new Date()
        , millisecondDiff = endDate.getTime() - currentDate.getTime() // get difference in milliseconds
        , timeRemaining = {
            days: 0
            , hours: 0
            , minutes: 0
            , seconds: 0
        }
        ;

    if(millisecondDiff > 0) {
        millisecondDiff = Math.floor( millisecondDiff/1000 ); // kill the "milliseconds" so just secs

		timeRemaining.days = Math.floor( millisecondDiff/86400 ); // days
		millisecondDiff = millisecondDiff % 86400;

		timeRemaining.hours = Math.floor( millisecondDiff/3600 ); // hours
		millisecondDiff = millisecondDiff % 3600;

		timeRemaining.minutes = Math.floor( millisecondDiff/60 ); // minutes
		millisecondDiff = millisecondDiff % 60;

		timeRemaining.seconds = Math.floor(millisecondDiff); // seconds

        setTimeout(function() {
            timer(endDate, callback);
        }, interval);
    }
    
    callback(timeRemaining);
}

Where is the JSON in there ?