title: Unix Timestamp in Sencha Touch DatePickerField
body: <p>I am trying to use a Unix Timestamp value as the default value for a DatePickerField in Sencha Touch. Here's the code I'm using for the form:</p>
  
  <pre><code>var profileForm = new Ext.form.FormPanel({
      title: 'Profile',
      standardSubmit : false,
      items: [{
          xtype: 'fieldset',
          title: '',
          instructions: 'Edit your profile above',
          defaults: { labelAlign: 'left', labelWidth: '40%' },
          items: [{ xtype: 'datepickerfield', name: 'dob', label: 'DoB', value: user.dob }]
      }]
  });
  </code></pre>
  
  <p>I've tried adding <code>dataType: 'time'</code> to the declaration, but without success. Any thoughts on how this can be achieved without creating a custom Date class to handle timestamps?</p>