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DateTime dt = System.DateTime.Now;
long milliseconds = dt.Millisecond + 1000 * dt.Second +
60000 * dt.Minute + 3600000 * dt.Hour;
double mm = new TimeSpan(days, hours, minutes, seconds, milliseconds).TotalMilliseconds;
double mm = new TimeSpan(0, 1, 14, 51, 0).TotalMilliseconds;
// 01:14:51 