A thin wrapper around a millisecond value that allows JDBC to identify
this as an sql DATE value. A milliseconds value represents the number
of milliseconds that have passed since January 1,1970 00:00:00.000 GMT.

To conform with the definition of sql DATE,the millisecond values
wrapped by a java.sql.Date instance must be ‘normalized’ by setting
the hours,minutes,seconds,and milliseconds to zero in the
particular time zone with which the instance is associated.

或从JodaTime：@L_404_3@或LocalDate(谢谢
@cdeszaq)

DateMidnight defines a date where the time component is fixed at
midnight. The class uses a time zone,thus midnight is local unless a
UTC time zone is used.

It is important to emphasise that this class represents the time of midnight on any given day. Note that midnight is defined as 00:00,which is at the very start of a day.