I Have a list of appointments at 9am, 9:15am, 10am, The appointment is scheduled dynamically. I have to send the push notification for the time scheduled.

* As the scheduled time is dynamic or editable by HR.
* I 'm running a cron for every one minute, if i find the time scheduled falls under , the cron is running like every one minute.

Please suggest a plan for the execution, because i don't find this as a best solution.