What hn_throwaway_99 is saying is that there aren't two concepts. For java.util.Date there's only one concept, which is that it wraps a long number of milliseco

What hn_throwaway_99 is saying is that there aren't two concepts. For java.util.Date there's only one concept, which is that it wraps a long number of milliseconds since the epoch. So it has nothing to do with dates on a calendar, despite its name.