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From: Tom Lane <[email protected]>
To: [email protected]
Cc: [email protected]
Subject: Re: INTERVAL output format for iso_8601 is without dashes
Date: Sun, 15 Mar 2026 16:14:23 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

PG Doc comments form <[email protected]> writes:
> https://www.postgresql.org/docs/current/datatype-datetime.html#DATATYPE-INTERVAL-OUTPUT
> The output format for mixed Interval in style specification iso_8601 is
> documented incorrectly.
> The documentation says `P-1Y-2M3D​T-4H-5M-6S` while in reality there are no
> dashes: `P1Y2M3D​T4H5M6S`

It looks correct to me:

regression=# set intervalstyle TO iso_8601;
SET
regression=# select '-1 year -2 mons +3 days -04:05:06'::interval;
      interval       
---------------------
 P-1Y-2M3DT-4H-5M-6S
(1 row)

			regards, tom lane

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