how could make a slider timer?

I know how to create a timer and put it in a text but have can I put the value of timer in the slider?any idea?

Try this:

public RawImage yourSlider; // set RectTransform Anchors min, max and pivot X to 0 
    public float widht;
    public float totalTime = 120; // 2 min
    public float actualTime; // the current time, you can set it each frame

    private void Start()
    {
        widht = yourSlider.rectTransform.rect.width;
    }
    private void Update()
    {
        // actualTime = current time
        yourSlider.rectTransform.sizeDelta = new Vector2((widht / totalTime) * actualTime, yourSlider.rectTransform.sizeDelta.y);

    }