defaults

defaults.js

// backbone's `defaults` can be a function.
//
// if you need the default value to be evaluated
// every time you instantiate a new model, then
// it should be a function, not an object literal.
//
// object literals are only evaluated once, when the
// object is defined.


 w.model = Backbone.Model.extend({
    defaults : function() {
      return {
        timestamp : moment().format('M/D/YYYY h:mm:ss')
      };
    }
  });