title: How to generate an ID which is valid for 15 seconds in flutter?
body: <p>I want to generate a unique ID for cloud Firebase or any other plugin in flutter. I need help in creating a function that generates an ID every 15 seconds and would be the same for all users that generate the ID at a given time.</p>
  <p>E.g.</p>
  <ol>
  <li>User A and B generate an ID at the same time, the returned ID is ABCD.</li>
  <li>User A generates an ID, gets ID ABCD as a result.User B within 15 seconds tries to generate an ID and gets ABCD as the result.But,User B generates an ID 15 seconds later, gets EFGH as a result.</li>
  </ol>