title: How to send cloud message 10 minutes before start in firebase
body: <p>I'm programming an event-based web app using javascript and firebase. What I want is 10 minutes before the start of the event a cloud message to the organiser.
  I suppose that I must add the notification immediately after the reservation has been added to the database but I have no idea what this &quot;thing&quot; must contain.</p>
  <pre><code>function AddEvent(){
  //Event Added to firebase
  //---Something to set a message with eventtime-10 minutes
  }
  </code></pre>
  <p>I really appreciated it if someone can help me and also expand my knowledge.</p>
  <p>Kind regards</p>