public TimeOfDay Add(TimeSpan timeSpan)
{
TimeOfDay result = new TimeOfDay(BaseValue.Add(timeSpan.ToSystemTimeSpan()),
m_microsecond, m_nanosecond);
result = result.AddMicrosecondsInternal(timeSpan.Microseconds);
result = result.AddNanosecondsInternal(timeSpan.Nanoseconds);
return(result.CheckForWrapAround());
}