How to make a basic timer that works as the timer in our phone

[Harsheet dham]

How to make a timer that works like a timer in our phone & it should be a user input program that's says "Time is up" after the time expires
PS thank you in advance

 

[getochkn]

Learn to program and use one of the thousand programming languages that could do thst in about 6 lines of code.

Or go download one of thw thousand programs out there that someone made by learning programming and using 6 lines of code