php - How to prompt notification on user time set in flutter

Solution:

You can subtract the timestamp at which user wants the alarm and the current timestamp. After that you can schedule the cloud function to trigger notification at that time like for every 5 minutes:-

exports.scheduledFunction = functions.pubsub.schedule('every 5 minutes').onRun((context) => {
  console.log('This will be run every 5 minutes!');
  return null;
});
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or you can put the time at which he wants like on 5th august 13:45 :-

exports.scheduledFunction = functions.pubsub.schedule('45 13 5 8 *').onRun((context) => {
      console.log('This will run on 5th August at 13:45!');
      return null;
    });
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To understand the second pls refer schedules

Now in the function add the push notification code.