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From: David E. Wheeler <[email protected]>
To: Junwang Zhao <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Subject: Re: jsonpath: Inconsistency of timestamp_tz() Output
Date: Tue, 9 Jul 2024 10:22:03 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
	<CAEG8a3J2rBZ-S2VpwJCsWoLSmdSqWfnd0QH9kO_YE4ZJFSqGXQ@mail.gmail.com>
	<[email protected]>

On Jul 9, 2024, at 10:07, David E. Wheeler <[email protected]> wrote:

> So perhaps I had things reversed before. Maybe it’s actually doing the right then when it converts a timestamp to a timestamptz, but not when it the input contains an offset, as in your example.

To clarify, there’s an inconsistency in the output of timestamp_tz() depending on whether the input has an offset or not. With offset:

david=# select jsonb_path_query_tz('"2024-08-15 12:34:56-05"', '$.timestamp_tz()');
     jsonb_path_query_tz     
-----------------------------
 "2024-08-15T12:34:56-05:00"

And without:

david=# select jsonb_path_query_tz('"2024-08-15 12:34:56"', '$.timestamp_tz()');
     jsonb_path_query_tz     
-----------------------------
 "2024-08-15T16:34:56+00:00"

I suspect the latter is correct, given that the timestamptz type appears to be an int64, presumably always in UTC. I don’t understand where the first example stores the offset.

Best,

David

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