title: Node Js Express . how to schedule task
body: <p>How can I schedule a job or task to be executed at a certain point in time?</p>
  
  <p>I have crons for tasks that execute recurrently, but let's say I create a calendar event and I want my server to send a notification whenever it is the time of the event.</p>
  
  <p>Also, will this be deleted whenever the server is restarted? Should I reschedule the job on each startup?</p>