Message-ID: <gh-pgjdbc-pgjdbc-3930-c3859151521@github.com>
From: "AFulgens (@AFulgens)" <noreply+AFulgens@github.com>
To: "pgjdbc/pgjdbc" <noreply+pgjdbc-pgjdbc@github.com>
Date: Fri, 06 Feb 2026 09:41:59 +0000
Subject: Re: [pgjdbc/pgjdbc] issue #3930: Revert semantic calendar changes introduced with #3837
In-Reply-To: <gh-pgjdbc-pgjdbc-3930@github.com>
References: <gh-pgjdbc-pgjdbc-3930@github.com>
List-Id: <gh-pgjdbc-pgjdbc.github.com>
X-GitHub-Author-Login: AFulgens
X-GitHub-Comment-Id: 3859151521
X-GitHub-Comment-Type: issue_comment
X-GitHub-Issue: 3930
X-GitHub-Repo: pgjdbc/pgjdbc
X-GitHub-Type: comment
X-GitHub-Url: https://github.com/pgjdbc/pgjdbc/issues/3930#issuecomment-3859151521
Content-Type: text/plain; charset=utf-8

Simple example for clarity:

Java code:
```
String insert;
insert = "insert into public.testtable(this_is_a_date) values (?)";
statement = connection.prepareStatement(insert);
statement.setDate(1, java.sql.Date.valueOf("1000-01-01"));
statement.executeUpdate();
insert = "insert into public.testtable(this_is_a_date) values ('1000-01-01')";
statement = connection.prepareStatement(insert);
statement.executeUpdate();

String select = "SELECT * FROM public.testtable";
statement = connection.prepareStatement(select);
resultSet = statement.executeQuery();

while (resultSet.next()) {
    String str = resultSet.getString(2);
    java.sql.Date date = resultSet.getDate(2);
    System.out.println("As String: " + str);
    System.out.println("As sql.Date: " + date);
    System.out.println("Epoch within sql.Date: " + date.getTime());
}
```

**Results with driver 42.7.8:**
Output:
```
As String: 1000-01-01
As sql.Date: 1000-01-01
Epoch within sql.Date: -30609795600000
As String: 1000-01-01
As sql.Date: 1000-01-01
Epoch within sql.Date: -30609795600000
```

psql:
```
postgres=# select * from public.testtable;
 id | this_is_a_date
----+----------------
 48 | 1000-01-01
 49 | 1000-01-01
(2 rows)
```


**Result with driver 42.7.9:**
Output:
```
As String: 1000-01-06
As sql.Date: 1000-01-01
Epoch within sql.Date: -30609795600000
As String: 1000-01-01
As sql.Date: 0999-12-27
Epoch within sql.Date: -30610227600000
```

psql:
```
postgres=# select * from public.testtable;
 id | this_is_a_date
----+----------------
 42 | 1000-01-06
 43 | 1000-01-01
(2 rows)
```