diff --git a/SCRUM-Timer/Timer.cs b/SCRUM-Timer/Timer.cs
index 49dccf6..36e9bb1 100644
--- a/SCRUM-Timer/Timer.cs
+++ b/SCRUM-Timer/Timer.cs
@@ -1,21 +1,40 @@
 using System;
+using System.Threading;
 
 namespace SCRUM_Timer;
 
 public class Timer
 {
-    public TimeOnly ActualTime { get; private set; }
+    public TimeSpan ActualTime { get; private set; }
     public bool isRunning;
 
     public Timer()
     {
-        TimeOnly ActualTime = new TimeOnly(0,5,0);
+        ActualTime = new TimeSpan(0,5,0);
         isRunning = false;
         
     }
 
     public void StartStop()
     {
+        if (!isRunning)
+        {
+            isRunning = true;
+            TimerTick();
+        }
+        else
+        {
+            isRunning = false;
+        }
         
     }
+
+    private void TimerTick()
+    {
+        while (isRunning)
+        {
+            Thread.Sleep(1000);                
+            ActualTime =- TimeSpan.FromSeconds(1);
+        }
+    }
 }
\ No newline at end of file