How to make a timer in Processing?

So I know this is a really simple question, but I can’t figure out how to do it!

So I have this code:

void draw()
    if (startGame)
        // do stuff

   if (lose)

void mousePressed()
    startGame = true;

So as soon as the person pressed the mouse, it starts the timer. And when the person loses the game, the timer stops. Now I considered using millis() however I can’t figure out how it make it start when the game starts.

Can anyone help me? Thanks

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millis() started counting as soon as you started your sketch.

An example here: