Easily format a past date with this object. It has two public methods one that will give a rough estimate with the largest part of time. Something like: 2 hours ago. The second will give you all the parts of time that have elapsed as an object. Parts that are too large are returned as null. Check the comments for more information.

DateFromNow.js

/*

License: MIT

Easily formattable date difference. 

DateFromNow(someDate).simple(); //ex. returns '3 days ago';
DateFromNow(someDate).parts(); //ex. returns {years: null, months: null, days: 3, hours: 8, minutes: 52, seconds: 43}; 

*/
function DateFromNow(date)
{
    var milliseconds = {year: 3.15569e+10, month: 2.62974e+9, day: 86400000, hour: 3600000, minute: 60000, second: 1000};
    var difference = Date.now() - Date.parse(date);
    var timeConvert = function(type)
    {
        var time = difference > milliseconds[type] ? Math.floor(difference / milliseconds[type]) : null;
        difference = difference % milliseconds[type];
        return time;
    };

    //Returns a string of the largest part of 
    //time for the time differece. 
    var simple = function()
    {
        for(var key in milliseconds)
        {
            var converted = timeConvert(key);
            if(converted !== null)
            {
                key += converted > 1 ? 's' : '';
                return [converted, key, 'ago'].join(' ');
            }
        }
        return 'just now';
    };

    //Return all the parts of the time difference
    var parts = function()
    {
        return {
            years: timeConvert('year'),
            months: timeConvert('month'),
            days: timeConvert('day'),
            hours: timeConvert('hour'),
            minutes: timeConvert('minute'),
            seconds: timeConvert('second')
        };
    };

    return {simple: simple, parts: parts};
}

http://codemana.com/6444608#DateFromNow.js-L13 Commenting just to comment...