date_attr.js

function pad(n, width, z) {
  z = z || '0';
  n = n + '';
  return n.length >= width ? n : new Array(width - n.length + 1).join(z) + n;
}

Ember.Model.dataTypes[Date] = {
  deserialize: function(string) {
    if(!string) { return null; }
    if(string.match(/^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}$/)) {
      var now = new Date(),
          offset = now.getTimezoneOffset() / 60;

      var offsetString = pad(Math.abs(offset), 2) + '00';
      string = string + (offset > 0 ? '-' : '+') + offsetString;
    }
    return new Date(string);
  },
  serialize: function (date) {
    if(!date) { return null; }
    return date.toISOString();
  },
  isEqual: function(obj1, obj2) {
    if (obj1 instanceof Date) { obj1 = this.serialize(obj1); }
    if (obj2 instanceof Date) { obj2 = this.serialize(obj2); }
    return obj1 === obj2;
  }
};