JAVA 各种时间类型转换

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();initialize

//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());

//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.toInstant(ZoneOffset.of(ZoneId.systemDefault().getId()));
//ZonedDateTime转Instant
Instant zonedDateTimeInstant = zonedDateTime.toInstant();

//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();

//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());

//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());

//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);