Java 8 – Convert ZonedDateTime to Timestamp
Java example to convert java.time.ZonedDateTime to java.sql.Timestamp and vice verse.
1. ZonedDateTime -> Timestamp
TimeExample1.java
package com.mkyong.jdbc;
import java.sql.Timestamp;
import java.time.ZonedDateTime;
public class TimeExample1 {
public static void main(String[] args) {
ZonedDateTime now = ZonedDateTime.now();
// 1. ZonedDateTime to TimeStamp
Timestamp timestamp = Timestamp.valueOf(now.toLocalDateTime());
// 2. ZonedDateTime to TimeStamp , no different
Timestamp timestamp2 = Timestamp.from(now.toInstant());
System.out.println(now); // 2019-06-19T14:12:13.585294800+08:00[Asia/Kuala_Lumpur]
System.out.println(timestamp); // 2019-06-19 14:12:13.5852948
System.out.println(timestamp2); // 2019-06-19 14:12:13.5852948
}
}
Output
2019-06-19T14:12:13.585294800+08:00[Asia/Kuala_Lumpur]
2019-06-19 14:12:13.5852948
2019-06-19 14:12:13.5852948
2. Timestamp -> ZonedDateTime
TimeExample2.java
package com.mkyong;
import java.sql.Timestamp;
import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZonedDateTime;
public class TimeExample2 {
public static void main(String[] args) {
Timestamp timestamp = Timestamp.from(Instant.now());
LocalDateTime localDateTimeNoTimeZone = timestamp.toLocalDateTime();
ZonedDateTime zonedDateTime1 = localDateTimeNoTimeZone.atZone(ZoneId.of("+08:00"));
ZonedDateTime zonedDateTime2 = localDateTimeNoTimeZone.atZone(ZoneId.of("Asia/Kuala_Lumpur"));
ZonedDateTime zonedDateTime3 = localDateTimeNoTimeZone.atZone(ZoneId.systemDefault());
ZonedDateTime zonedDateTime4 = localDateTimeNoTimeZone.atZone(ZoneId.of("-08:00"));
System.out.println(timestamp); // 2019-06-19 14:08:23.4458984
System.out.println(zonedDateTime1); // 2019-06-19T14:08:23.445898400+08:00
System.out.println(zonedDateTime2); // 2019-06-19T14:08:23.445898400+08:00[Asia/Kuala_Lumpur]
System.out.println(zonedDateTime3); // 2019-06-19T14:08:23.445898400+08:00[Asia/Kuala_Lumpur]
System.out.println(zonedDateTime4); // 2019-06-19T14:08:23.445898400-08:00
}
}
Output
2019-06-19 14:08:23.4458984
2019-06-19T14:08:23.445898400+08:00
2019-06-19T14:08:23.445898400+08:00[Asia/Kuala_Lumpur]
2019-06-19T14:08:23.445898400+08:00[Asia/Kuala_Lumpur]
2019-06-19T14:08:23.445898400-08:00
References
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The following two are NOT same:
// 1. ZonedDateTime to TimeStamp
Timestamp timestamp = Timestamp.valueOf(now.toLocalDateTime());
// 2. ZonedDateTime to TimeStamp , no different
Timestamp timestamp2 = Timestamp.from(now.toInstant());
ZonedDateTime.toLocalDateTime() does not consider timezone or offset.
Wondering why this hasn’t been corrected?
I wanted to get timestamp of a specific date,Specific location I passed as string. Here “20200206-000001” is that string, its a past date and specific location Germany.
I did following:
Timestamp.valueOf(LocalDateTime.parse(“20200206-000001”, DateTimeFormatter.ofPattern(“yyyyMMdd-HHmmss”)).atZone(ZoneId.of(“Europe/Berlin”)).toLocalDateTime())
But this doesn’t give correct timestamp value.
Solution is:
ZonedDateTime zonedDateTime = ZonedDateTime.of(LocalDateTime.parse(beginOfDay, DateTimeFormatter.ofPattern(“yyyyMMdd-HHmmss”)), UTC);
System.out.println(zonedDateTime.toEpochSecond());
Basically:
Timestamp timestampGermany = Timestamp.valueOf(LocalDateTime.parse(“20200206-000001”, DateTimeFormatter.ofPattern(“yyyyMMdd-HHmmss”)).atZone(ZoneId.of(“Europe/Berlin”)).toLocalDateTime());
Timestamp timestampLosAngles = Timestamp.valueOf(LocalDateTime.parse(“20200206-000001”, DateTimeFormatter.ofPattern(“yyyyMMdd-HHmmss”)).atZone(ZoneId.of(“America/Los_Angeles”)).toLocalDateTime());
System.out.println(“timestampGermany:” + timestampGermany.getTime() + ” timestampUSA: ” + timestampLosAngles.getTime() + ” ” + “TS:” + timestampLosAnglesAgain.getTime());
All these give same time which doesnt look right.
Solution is:
ZonedDateTime zonedDateTime = ZonedDateTime.of(LocalDateTime.parse(beginOfDay, DateTimeFormatter.ofPattern(“yyyyMMdd-HHmmss”)), UTC);
System.out.println(zonedDateTime.toEpochSecond());