If you want to remove part of time from a DateTime, try using this code:
DateTime dt = new DateTime();dt = DateTime.Now; //ex: 31/1/2017 6:30:20 PMTimeSpan remainingTime = new TimeSpan(0, dt.Hour - 5, dt.Minute - 29, dt.Second - 19);dt=dt.Add(remainingTime);label1.Text = dt.ToString("HH:mm:ss"); // must be HH not hhthe output : 01:01:01