Create a timer from the client side

I read about Timers and it still still not very clear to me how can I create Timer from the client side.
Bascically, the user will be posting something (creating a row in the POST table). If the certain condition is not met within 2 days(field on that row is updated) then row should be deleted.

So I imagine the android client code will create a timer and will cancel the time at a later point if the condition is met.

How can I can I create and start a time from Android client side and how can I save a reference to that time in the Database?

thank you

You cannot start timer from the Android client side or change it. You can manage it only in the business logic (JS, Java).