how to handle code server side

using Normal.Realtime;  

public class Stopwatch : RealtimeComponent<StopwatchModel> {  
    public float time {  
        get {  
            // Return 0 if we're not connected to the room yet.  
            if (model == null) return 0.0f;  
  
            // Make sure the stopwatch is running  
            if (model.startTime == 0.0) return 0.0f;  
  
            // Calculate how much time has passed  
            return (float)(realtime.room.time - model.startTime);  
        }  
    }  
  
    public void StartStopwatch() {  
        model.startTime = realtime.room.time;  
    }  
}