countdown timer
A simple countdown timer.
Countdown Timer
https://www.online-stopwatch.com/countdown-timer/
https://www.online-stopwatch.com/
https://www.online-stopwatch.com/countdown/
https://www.timeanddate.com/countdown/create
https://www.timeanddate.com/timer/ !!!!!!
https://www.microsoft.com/he-il/store/p/countdown-timer/9wzdncrdx1g9
CountDownTimer
https://developer.android.com/reference/android/os/CountDownTimer.html