title: Schedule a Firebase Cloud Function to run every 30 minutes at the start of every hour and then 30 minutes later
body: <p>I saw that Firebase recently launched a way to schedule Cloud Function at regular intervals. I have been using an online crob job scheduler and currently migrating those jobs over to Firebase Cloud Function. I want to run the Cloud Function every 30 minutes at the start of every hour and then 30 minutes. So, say I deploy the function at 1:45 PM. Then the Cloud Function should run at 2:00 PM, 2:30 PM, 3:00 PM and so on.</p>
  
  <p>I tried using the <code>schedule('every 30 minutes')</code> but this runs the Cloud Function after 30 minutes from the time it is deployed.</p>
  
  <p>Is there a way to specify the schedule such that it runs as described above?</p>