LPARAMETERS tnStamp

RETURN IIF(tnStamp = 0,;
   {//::},
   DateTime(1980 + BitAnd(BitRShift(tnStamp, 25), 63),
      BitAnd(BitRShift(tnStamp, 21), 15),;
      BitAnd(BitRShift(tnStamp, 16), 31),;
      BitAnd(BitRShift(tnStamp, 11), 31),;
      BitAnd(BitRShift(tnStamp, 5), 63),;
      BitAnd(BitLShift(tnStamp, 1), 15)))