title: Update parent scope variable in AngularJS
body: <p>I have two controllers, one wrapped within another. Now I know the child scope inherits properties from the parent scope but is there a way to update the parent scope variable? So far I have not come across any obvious solutions.</p>
  
  <p>In my situation I have a calendar controller within a form. I would like to update the start and end dates from the parent scope (which is the form) so that the form has the start and end dates when submitted.</p>