How to make this display milliseconds?

I am making a timer where they have a certain amount of time to beat a level, and I want it to display milliseconds as well. How do I do that?

public float timeLeft = 15f;

    public GameObject player;
    public GameObject environment;

    [Header("UI Components")]

    public Text timer;
    public GameObject timerText;
    public GameObject healthText;
    public GameObject shieldText;
    public GameObject livesText;
    public GameObject skipsText;
    public GameObject pointsText;
    public GameObject respawnScreen;

    private bool dead;

    private void Update()
        timeLeft -= Time.deltaTime;

        if (timeLeft <= 0)

    private void UpdateLevelTimer(float totalSeconds)
        int minutes = Mathf.FloorToInt(totalSeconds / 60f);
        int seconds = Mathf.RoundToInt(totalSeconds % 60);
        float milliseconds = Mathf.FloorToInt(totalSeconds * 1000);

        string formatedSeconds = seconds.ToString();

        if (seconds == 60) 
            seconds = 0;
            minutes += 1;

        timer.text = minutes.ToString("00") + ":" + seconds.ToString("00") + "." + milliseconds.ToString("00");
        timeLeft = Mathf.Clamp(timeLeft, 0, 12000000);

    private void Die() 
        dead = true;
        print("Player has died.");

I’d recommend leveraging the TimeSpan class so you won’t need to bother with the rounding and modding. You also gain flexible formatting through the ToString call.

You should be able to change the entirety of UpdateLevelTimer to a single line:

timer.text = TimeSpan.FromSeconds(timeLeft).ToString("mm\\:ss\\.fff");

totalSeconds will be something like this:

totalSeconds = 14,956;

so if you want to print the ms you need to rest the seconds before multiplying * 1000

 float milliseconds = ((float)totalSeconds - seconds) * 1000

Use System.DateTime.Now.Millisecond, then on the next pull, do the same, or a combination of thus. Regular C# works in Unity also…