How to make a timer?

Getting Started
1

Is this currently the best way to make a timer? Will it be consistent across devices and different frame rates?

float timeLeft = 10f;
function Update()
{
     timeLeft -= Time.deltaTime;
     if ( timeLeft < 0 )
     {
         GameOver();
     }
}
2

That will generally work, but Time.deltaTime is affected by the timescale, and I think it gets impacted if the game is slowing down due to hitting Maximum Allowed Timestep (not sure on that one). Time.unscaledTime might be the better choice, or possibly DateTime.Now().

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