Here is an entire example app. Running on Java 14 with Text Blocks preview feature enabled for fun. Using H2 version 1.4.200.

package work.basil.example;

import org.h2.jdbcx.JdbcDataSource;

import java.sql.*;
import java.time.*;
import java.util.Objects;

public class H2ExampleIdentity
{
    public static void main ( String[] args )
    {
        H2ExampleIdentity app = new H2ExampleIdentity();
        app.doIt();
    }

    private void doIt ( )
    {
        JdbcDataSource dataSource = Objects.requireNonNull( new JdbcDataSource() );  // Implementation of `DataSource` bundled with H2.
        dataSource.setURL( "jdbc:h2:mem:h2_identity_example_db;DB_CLOSE_DELAY=-1" ); // Set `DB_CLOSE_DELAY` to `-1` to keep in-memory database in existence after connection closes.
        dataSource.setUser( "scott" );
        dataSource.setPassword( "tiger" );

        String sql = null;

        try (
                Connection conn = dataSource.getConnection() ;
        )
        {
            sql = """
                  CREATE TABLE event_
                     ( 
                        id_ IDENTITY NOT NULL PRIMARY KEY,  -- ⬅ `identity` = auto-incrementing integer number.
                        title_ VARCHAR NOT NULL ,
                        start_ TIMESTAMP WITHOUT TIME ZONE NOT NULL ,
                        duration_ VARCHAR NOT NULL
                      )
                  ;
                  """;
            System.out.println( "sql:  
" + sql );
            try ( Statement stmt = conn.createStatement() ; )
            {
                stmt.execute( sql );
            }

            // Insert row.
            sql = """
                  INSERT INTO event_ ( title_ , start_ , duration_ )
                  VALUES ( ? , ? , ? )
                  ;
                  """;
            try (
                    PreparedStatement pstmt = conn.prepareStatement( sql , Statement.RETURN_GENERATED_KEYS ) ;
            )
            {
                ZoneId z = ZoneId.of( "America/Montreal" );
                ZonedDateTime start = ZonedDateTime.of( 2021 , 1 , 23 , 19 , 0 , 0 , 0 , z );
                Duration duration = Duration.ofHours( 2 );

                pstmt.setString( 1 , "Java User Group" );
                pstmt.setObject( 2 , start.toOffsetDateTime() );
                pstmt.setString( 3 , duration.toString() );

                pstmt.executeUpdate();
                try (
                        ResultSet rs = pstmt.getGeneratedKeys() ;
                )
                {
                    while ( rs.next() )
                    {
                        int id = rs.getInt( 1 );
                        System.out.println( "generated key: " + id );
                    }
                }
            }

            // Query all.
            sql = "SELECT * FROM event_ ;";
            try (
                    Statement stmt = conn.createStatement() ;
                    ResultSet rs = stmt.executeQuery( sql ) ;
            )
            {
                while ( rs.next() )
                {
                    //Retrieve by column name
                    int id = rs.getInt( "id_" );
                    String title = rs.getString( "title_" );
                    OffsetDateTime odt = rs.getObject( "start_" , OffsetDateTime.class );  // Ditto, pass class for type-safety.
                    Instant instant = odt.toInstant();  // If you want to see the moment in UTC.
                    Duration duration = Duration.parse( rs.getString( "duration_" ) );

                    //Display values
                    ZoneId z = ZoneId.of( "America/Montreal" );
                    System.out.println( "id_" + id + " | start_: " + odt + " | duration: " + duration + " ➙ running from: " + odt.atZoneSameInstant( z ) + " to: " + odt.plus( duration ).atZoneSameInstant( z ) );
                }
            }
        }
        catch ( SQLException e )
        {
            e.printStackTrace();
        }
    }
}

其次,见结果。

Instant, OffsetDateTime, & ZonedDateTime