momentjs + ember = {{timeago}} helper!

ember-timeago.js

// ember-timeago.js
// Using momentjs to provide neat helper for fromNow() calls.

App.Clock = Em.Object.create({
  seconds: 0,
  minutes: 0,
  hours: 0,
  init: function() {
    this.tick();
  },
  tick: function() {
    var date = new Date;
    this.set('seconds', date.getSeconds());
    this.set('minutes', date.getMinutes());
    this.set('hours', date.getHours());

    var clock = this;
    setTimeout(function() {
      clock.tick();
    }, 1000);
  }
});

// Usage: {{timeago time=YOUR_DATETIME_OBJECT_HERE}} => "3 seconds ago". HORRAY!!!
App.TimeAgoView = Em.View.extend({
  tagName: 'time',
  template: Ember.Handlebars.compile('{{ view.fromNow }}'),
  secondsBinding: 'App.Clock.seconds',
  value: '',
  fromNow: function() {
    // Call momentjs once in 10 seconds.
    if (this.get('value') === '' || this.get('seconds') % 10 === 0) {
      this.set('value', moment(this.get('time')).fromNow());
    }

    return this.get('value');
  }.property('seconds')
});

Ember.Handlebars.helper('timeago', App.TimeAgoView);