Ah, thanks. I didn't know that Unix time is discontinuous over leap seconds! I had thought just the opposite. And now I understand some system failures I kno

Ah, thanks. I didn't know that Unix time is discontinuous over leap seconds! I had thought just the opposite. And now I understand some system failures I know about that occurred during leap seconds but which I've never understood. I think to handle leap seconds, one must carry around both Unix timestamp and a "leap delta". The timestamp is needed to convert to calendar/clock representation and the "leap delta" is needed to compare two Unix timestamps for actual elapsed time. What a headache!