JavaScript now-now

from-now.js

/*
 *     var pastDate = new Date('2014-10-01T02:30');
 *     var message = fromNow(pastDate);
 *     //=> '2 days ago'
 *
 * @param  {Date} Native JavaScript Date object
 * @return {string}
 */
function fromNow(date) {
    var seconds = Math.floor((new Date() - date) / 1000);
    var years = Math.floor(seconds / 31536000);
    var months = Math.floor(seconds / 2592000);
    var days = Math.floor(seconds / 86400);

    if (days > 548) {
        return years + ' years ago';
    }
    if (days >= 320 && days <= 547) {
        return 'a year ago';
    }
    if (days >= 45 && days <= 319) {
        return months + ' months ago';
    }
    if (days >= 26 && days <= 45) {
        return 'a month ago';
    }

    var hours = Math.floor(seconds / 3600);

    if (hours >= 36 && days <= 25) {
        return days + ' days ago';
    }
    if (hours >= 22 && hours <= 35) {
        return 'a day ago';
    }

    var minutes = Math.floor(seconds / 60);

    if (minutes >= 90 && hours <= 21) {
        return hours + ' hours ago';
    }
    if (minutes >= 45 && minutes <= 89) {
        return 'an hour ago';
    }
    if (seconds >= 90 && minutes <= 44) {
        return minutes + ' minutes ago';
    }
    if (seconds >= 45 && seconds <= 89) {
        return 'a minute ago';
    }
    if (seconds >= 0 && seconds <= 45) {
        return 'a few seconds ago';
    }
}