Fuzzy time since a given date

fuzzy_timesince.js

var fuzzy_timesince = function(when) {
    parts = [
        ['year', 60 * 60 * 24 * 365],
        ['month', 60 * 60 * 24 * 30],
        ['week', 60 * 60 * 24 * 7],
        ['day', 60 * 60 * 24],
        ['hour', 60 * 60],
        ['minute', 60]
    ];

    now = new Date();
    delta = (now - when) / 1000;

    for (i in parts) {
        val = parseInt(delta / parts[i][1]);
        if (val >= 1) {
            part = parts[i][0];
            break;
        }
    }

    if (val <= 0) {
        return 'just now';
    }

    if (val > 1) { s = 's'} else { s = '' }
    return val + ' ' + part + s;
};