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From: davecramer (@davecramer) <[email protected]>
To: pgjdbc/pgjdbc <[email protected]>
Subject: Re: [pgjdbc/pgjdbc] issue #3692: Wrong time formatting ResultSet.getTime(); for Europe/Belgrade and "Europe/Prague"
Date: Thu, 21 Aug 2025 23:55:52 +0000
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

So this is an artifact of how timestamptz is handled by postgres

```
set timezone to "America/Los_Angeles";
INSERT INTO t VALUES                                                                                                              
('2023-11-10 09:00:00', '2023-11-10 09:00:00-08'), -- PST (UTC-8)                                                                           
 ('2023-03-13 09:00:00', '2023-03-13 09:00:00-07'); -- PDT (UTC-7);
INSERT 0 2
postgres=# table t;
         ts          |           tz
---------------------+------------------------
 2023-11-10 09:00:00 | 2023-11-10 09:00:00-08
 2023-03-13 09:00:00 | 2023-03-13 09:00:00-07
(2 rows)

postgres=# set timezone to gmt;
SET
postgres=# table t;
         ts          |           tz
---------------------+------------------------
 2023-11-10 09:00:00 | 2023-11-10 17:00:00+00
 2023-03-13 09:00:00 | 2023-03-13 16:00:00+00

```

Note the time that is stored in the second row is actually 1 hour earlier as. you had asked. It does not honour your UTC-7 as being the timezone for that insert it calculates the time `2023-03-13 09:00:00-07` and stores it in `America/Los_Angeles` timezone (well not really, it actually stores it in GMT)

See what the time was when I set the session timezone to GMT!

Postgres does not actually store a timezone with the timestamptz. it just takes whatever is in the column and displays it correctly for the current timezone.

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