How to make Pomodoro Timer App

I’m making a Pomodoro timer app, but I can’t do it well
Please tell me how to make it.

I tried using the marketplace countdown timer.
I could make simple timer ( only “start” / “stop” timer).
But I can’t “pause” or “record the remaining timer time in the database”.

Please tell me how to calculate the time (the number of seconds is calculated by subtracting the time when Start is pressed and the time when Pause is pressed).

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