Live countdown timer

Is it possible to have a live timer on a database or site and use that timer to check if it reaches to a certain time and when it does run a method in either java, swift, and web . For example:

if (liveTimerFromDatabaseOrOnlineSite == 20seconds) {
    method1();
} else if (liveTimerFromDatabaseOrOnlineSite == 30seconds) {
    method2();
} etc....