how to save only time in database without date

How to save only time of day in database without saving date? I am trying this statement but its save date and time:

    DateTime time= Convert.ToDateTime(开发者_如何学JAVArec.InOutTimes[i].entry.Value.ToShortDateString(),null)

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You can store the value as seconds or milliseconds, then use Timespan.

TimeSpan interval = TimeSpan.FromMilliseconds(500);
int millis = interval.TotalMilliseconds;