Relative dates

gistfile1.js

// Relative times
function prettyDate(date) {
    var date, seconds, formats, i = 0, f;
    date = new Date(date);
    seconds = (new Date - date) / 1000;
    formats = [
        [60, 'seconds', 1],
        [120, '1 minute ago'],
        [3600, 'minutes', 60],
        [7200, '1 hour ago'],
        [86400, 'hours', 3600],
        [172800, 'Yesterday'],
        [604800, 'days', 86400],
        [1209600, '1 week ago'],
        [2678400, 'weeks', 604800]
    ];

    while (f = formats[i ++]) {
        if (seconds < f[0]) {
            return f[2] ? Math.floor(seconds / f[2]) + ' ' + f[1] + ' ago' :  f[1];
        }
    }
    return 'A while ago';
}

You should checkout http://momentjs.com/ ;)

Yes, thanks! I'm using it for a while ;)