[solved ]UI rotation via button click

Hey, I try to rotate an Image when I click on a button each time 6°. I tried this:

transform.rotation = Quaternion.Angle(6 * Time.deltaTime, Vector3.forward);

but it caused wierd spinning issues were it was slow in the beginnung but got faster with each click (even with Time.deltaTime?!)

using UnityEngine;
using UnityEngine.UI;

public class Rotator : MonoBehaviour
{
	public Button Clockwise, CClockwise;
	public Toggle Wheel;

	public Vector3 startRot;
	public Vector3 endRot;

	public void RotPositive()         // do I need to remove the Listener?
	{
		Clockwise.onClick.AddListener(PosWheel);
	}
	public void RotNegative()
	{
		CClockwise.onClick.AddListener(NegWheel);
	}

	public void PosWheel()
	{
		if (Wheel.isOn)
		{
			endRot = new Vector3 (startRot.x, startRot.y, startRot.z + 6);
			transform.rotation = Quaternion.FromToRotation(startRot, endRot);
			startRot = transform.rotation.eulerAngles;
		}
	}
	public void NegWheel()
	{
		if (Wheel.isOn)
		{
			transform.rotation = Quaternion.AngleAxis(-6, startRot);
			startRot = transform.rotation.eulerAngles;
		}
	}

now the rotation is aplied once no matter what method is called and further button clicks have no impact at all…
please help :stuck_out_tongue:

I finally found it myself!

using UnityEngine;
using UnityEngine.UI;

public class Rotate : MonoBehaviour
{
	public Button Clockwise, CClockwise;
	public Toggle Wheel;
	
	public int degree = 5;
	private int sum;

	public void Update()
	{
		if (Mathf.Abs(sum) >= 360)
		{
			sum = 0;
		}
	}
	public void RotPositive()
	{
		if (Wheel.isOn)
		{
			sum -= degree;
			transform.rotation = Quaternion.AngleAxis(sum, Vector3.forward);
		}
	}
	public void RotNegative()
	{
		if (Wheel.isOn)
		{
			sum += degree;
			transform.rotation = Quaternion.AngleAxis(sum, Vector3.forward);
		}
	}
}