offset time (time with time zone) in jdbc PostgreSQL - postgresql

Question

I am trying to save and retrieve java.time.OffsetTime into PostgreSQL version 10.5, JDBC driver latest (v 42.2.5).
The Offset time is saved but with an invalid offset (it takes app server offset instead of the passed offset).
According to: https://jdbc.postgresql.org/documentation/head/8-date-time.html TIME WITH TIMEZONE is not supported (yet?).
Note that ZonedDateTime, Instant and OffsetTime / TIME [ WITHOUT
TIMEZONE ] are not supported
My question, is I want to save offset time into Postgres, so what are alternatives?
Note, I only care about time (it is actually a timetable) but I need to know the offset as well for comparing reasons with current_time.
My Example:
public class Customer {
#Id
#GeneratedValue
private Long id;
private String name;
#Column(columnDefinition = "time with time zone")
private OffsetTime serviceTime;
#Column(columnDefinition = "timestamp with time zone")
private OffsetDateTime serviceDateTime;
private Instant createdDate = Instant.now();
}
The main:
{
OffsetTime serviceTime = OffsetTime.parse("10:00+02:00");
OffsetDateTime serviceDateTime = OffsetDateTime.now().with(serviceTime);
System.out.println(serviceTime);
System.out.println(serviceDateTime);
Customer customer = new Customer().withName("wael")
.withServiceTime(serviceTime)
.withServiceDateTime(serviceDateTime);
System.out.println("customer: " + customer);
customerRepository.save(customer);
}
{
Customer dbCustomer = customerRepository.findById(1L).get();
OffsetTime dbServiceTime = dbCustomer.getServiceTime();
OffsetDateTime dbServiceDateTime = dbCustomer.getServiceDateTime();
System.out.println(dbServiceTime);
System.out.println(dbServiceDateTime);
System.out.println("from db customer: " + dbCustomer);
}
Database:
id created_date name service_date_time service_time
1 2018-10-15 10:38:27.814000 wael 2018-10-15 08:00:00.000000 10:00:00 +03:00
Output:
10:00+02:00
2018-10-15T10:00+02:00
customer: Customer(id=null, name=wael, serviceTime=10:00+02:00, serviceDateTime=2018-10-15T10:00+02:00, createdDate=2018-10-15T07:10:59.900Z)
10:00+03:00
2018-10-15T11:00+03:00
from db customer: Customer(id=1, name=wael, serviceTime=10:00+03:00, serviceDateTime=2018-10-15T11:00+03:00, createdDate=2018-10-15T07:10:59.900Z)
Note, my machine timezone is +3 (hence the printed information from db is +3), and my database server is a docker image with UTC datetime settings.
Observations:
The OffsetDatetime is saved correctly (as UTC) and retrieved correctly.
The OffsetTime is saved incorrect (it should be 10:00:00 +02:00 or 11:00:00 +03:00 or even 08:00:00 +00:00 not 10:00:00 +03:00, and retrieved incorrect!)

Answer 1

With JPA 2.2, you can also use OffsetTime in Postgresql.
#Column(name = "offset_time", columnDefinition = "TIME WITH TIME ZONE")
private OffsetTime offsetTime;
That's how it is stored in my database: 22:00:00.000000 +02:00