D = timeofday (T) returns the elapsed time since midnight for each element of the input datetime array T as a duration array D of the same size as T. For datetime arrays with a time zone, the result accounts for any daylight saving time shift occurring since midnight, so it may differ from the displayed clock time on the day of a transition. Not-A-Time (NaT) values in T are returned as NaN durations.

Source Code: datetime