How to make Frame Independent Timer Clock

Question

I want to make a frame Independent Timer that it work consistently across different computer configuration.

Answer 1

// ORIGINAL TIMER COUNTDOWN IN SECONDS
const float TIMER = 3;

// TIMER CURRENT TIME
float Timer;

// RUNS ON EACH FRAME
void Update()
{
    // SUBTRACT DELTA TIME FROM CURRENT TIME
    Timer -= Time.deltaTime;

    // TIMER WENT OFF
    if (Timer <= 0)
    {
        //DO SOMETHING
        Foo();

        // RESET TIMER
        Timer = TIMER;
    }
}