JavaScript Count Up Timer

I needed to add a timer to a software simulation project, but all I could find was a count down timer. I'm a still a JavaScript beginner, so I asked Google and was not disappointed! 

Here's the code:

// Create Storyline variables for seconds and minutes

var player = GetPlayer();

player.SetVar("seconds", 0);

player.SetVar("minutes", 0);

// JavaScript function to count seconds and reset every minute

function countSeconds() {

  var seconds = player.GetVar("seconds");

  var minutes = player.GetVar("minutes");

  seconds++;

  player.SetVar("seconds", seconds);

  if (seconds >= 60) {

    seconds = 0;

    player.SetVar("seconds", seconds);

    minutes++;

    player.SetVar("minutes", minutes);

  }

}

// Start the timer using setInterval

setInterval(countSeconds, 1000); // 1000 milliseconds = 1 second