JSR310 时间类型的相互转换

参数申明：

   final Date date = new Date();
   final Timestamp timestamp = new Timestamp(date.getTime());
   final Calendar calendar = Calendar.getInstance();
   final Instant instant = Instant.now();
   final LocalDateTime localDateTime = LocalDateTime.now();
   final ZonedDateTime zonedDateTime = ZonedDateTime.now();
   final LocalDate localDate = LocalDate.now();

转Instant

     //Date转Instant
     Instant dateInstant = date.toInstant();
     //Timestamp转Instant
     Instant timestampInstant = timestamp.toInstant();
     //Calendar转Instant
     Instant calendarInstant = calendar.toInstant();
     //LocalDateTime转Instant
     Instant localDateTimeInstant = localDateTime.atZone(ZoneId.systemDefault()).toInstant();
     //ZonedDateTime转Instant
     Instant zonedDateTimeInstant = zonedDateTime.toInstant();
     //LocalDate转Instant
     Instant localDateInstant = localDate.atStartOfDay(ZoneId.systemDefault()).toInstant();

转LocalDateTime

     //Date转LocalDateTime
     LocalDateTime dateLocalDateTime = LocalDateTime.ofInstant(date.toInstant(), ZoneId.systemDefault());
     //Timestamp转LocalDateTime
     LocalDateTime timestampLocalDateTime = timestamp.toLocalDateTime();
     //Calendar转LocalDateTime
     LocalDateTime calendarLocalDateTime = LocalDateTime.ofInstant(calendar.toInstant(), ZoneOffset.systemDefault());
     //Instant转LocalDateTime
     LocalDateTime instantLocalDateTime = LocalDateTime.ofInstant(instant, ZoneId.systemDefault());
     //ZonedDateTime转LocalDateTime
     LocalDateTime zonedDateTimeLocalDateTime = zonedDateTime.toLocalDateTime();
     //LocalDate转LocalDateTime
     LocalDateTime localDateLocalDateTime = localDate.atStartOfDay();

转ZonedDateTime

     //Date转ZonedDateTime
     ZonedDateTime dateZonedDateTime = ZonedDateTime.ofInstant(date.toInstant(), ZoneId.systemDefault());
     //Timestamp转ZonedDateTime
     ZonedDateTime timestampZonedDateTime = ZonedDateTime.ofInstant(timestamp.toInstant(), ZoneId.systemDefault());
     //Calendar转ZonedDateTime
     ZonedDateTime calendarZonedDateTime = ZonedDateTime.ofInstant(calendar.toInstant(), ZoneId.systemDefault());
     //Instant转ZonedDateTime
     ZonedDateTime instantZonedDateTime = instant.atZone(ZoneId.systemDefault());
     //LocalDateTime转ZonedDateTime
     ZonedDateTime localDateTimeZonedDateTime = localDateTime.atZone(ZoneId.systemDefault());
     //LocalDate转ZonedDateTime
     ZonedDateTime localDateZonedDateTime = localDate.atStartOfDay(ZoneId.systemDefault());

转Date

     //Timestamp转Date
     Date timestampDate = new Date(timestamp.getTime());
     //Calendar转Date
     Date calendarDate = calendar.getTime();
     //Instant转Date
     Date instantDate = Date.from(instant);
     //LocalDateTime转Date
     Date localDateTimeDate = Date.from(localDateTime.atZone(ZoneId.systemDefault()).toInstant());
     //ZonedDateTime转Date
     Date zonedDateTimeDate = Date.from(zonedDateTime.toInstant());
     //LocalDate转Date
     Date localDateDate = Date.from(localDate.atStartOfDay(ZoneId.systemDefault()).toInstant());

转Timestamp

     //Date转Timestamp
     Timestamp dateTimestamp = new Timestamp(date.getTime());
     //Calendar转Timestamp
     Timestamp calendarTimestamp = new Timestamp(calendar.getTimeInMillis());
     //Instant转Timestamp
     Timestamp instantTimestamp = Timestamp.from(instant);
     //LocalDateTime转Timestamp
     Timestamp localDateTimeTimestamp = Timestamp.valueOf(localDateTime);
     //ZonedDateTime转Timestamp
     Timestamp zonedDateTimeTimestamp = Timestamp.from(zonedDateTime.toInstant());
     //LocalDate转Timestamp
     Timestamp localDateTimestamp = Timestamp.valueOf(localDate.atStartOfDay());

转Calendar

     //Date转Calendar
     Calendar dateCalendar = Calendar.getInstance();
     dateCalendar.setTime(date);
     //Timestamp转Calendar
     Calendar timestampCalendar = Calendar.getInstance();
     timestampCalendar.setTimeInMillis(timestamp.getTime());
     //Instant转Calendar
     Calendar instantCalendar = GregorianCalendar.from(ZonedDateTime.ofInstant(instant, ZoneId.systemDefault()));
     //LocalDateTime转Calendar
     Calendar localDateTimeCalendar = GregorianCalendar.from(ZonedDateTime.of(localDateTime, ZoneId.systemDefault()));
     //ZonedDateTime转Calendar
     Calendar zonedDateTimeInstantCalendar = GregorianCalendar.from(zonedDateTime);
     //LocalDate转Calendar
     Calendar localDateCalendar = GregorianCalendar.from(localDate.atStartOfDay(ZoneId.systemDefault()));

转LocalDate

     //Date转LocalDate
     LocalDate dateLocalDate = LocalDate.ofInstant(date.toInstant(), ZoneId.systemDefault());  //jdk11
     LocalDate dateLocalDate = LocalDateTime.ofInstant(date.toInstant(), ZoneId.systemDefault()).toLocalDate();
     //Timestamp转LocalDate
     LocalDate timestampLocalDate = timestamp.toLocalDateTime().toLocalDate();
     //Calendar转LocalDate
     LocalDate calendarLocalDate = LocalDate.ofInstant(calendar.toInstant(), ZoneOffset.systemDefault());  //jdk11
     LocalDate calendarLocalDate = LocalDateTime.ofInstant(calendar.toInstant(), ZoneOffset.systemDefault()).toLocalDate();
     //Instant转LocalDate
     LocalDate instantLocalDate = LocalDate.ofInstant(instant, ZoneId.systemDefault());  //jdk11
     LocalDate instantLocalDate = LocalDateTime.ofInstant(instant, ZoneId.systemDefault()).toLocalDate();
     //LocalDateTime转LocalDate
     LocalDate localDateTimeLocalDate = localDateTime.toLocalDate();
     //ZonedDateTime转LocalDate
     LocalDate zonedDateTimeLocalDate = zonedDateTime.toLocalDate();