Time in 24 hr format from datetime

Hi,
I have a datetime variable which has the date and time .
I want only time part of it in 24 hr fotmat. How can i get it?

Dim newdt As DateTime = Convert.ToDateTime(mytime).AddSeconds(sectoadd) mydt.Rows(m).Item("Ptime") = newdt.ToString("MM/dd/yyyy HH:mm") Thanks
...