سلام شايد اين كمك كنه

DateTime
d1 = newDateTime();
DateTime d2 = newDateTime();
DateTime result = newDateTime();
//Different Times

d1 =
DateTime.Now;
d2 =
DateTime.Now.AddHours(1);
d2 =
DateTime.Now.AddMinutes(5);

//SUB

result = d1.AddSeconds((
double)(d2.Second));
result = result.AddMinutes((
double)(d2.Minute));
result = result.AddHours((
double)(d2.Hour));