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* INTERVAL output format for iso_8601 is without dashes
@ 2026-03-10 14:10 PG Doc comments form <[email protected]>
2026-03-15 20:14 ` Re: INTERVAL output format for iso_8601 is without dashes Tom Lane <[email protected]>
0 siblings, 1 reply; 4+ messages in thread
From: PG Doc comments form @ 2026-03-10 14:10 UTC (permalink / raw)
To: [email protected]; +Cc: [email protected]
The following documentation comment has been logged on the website:
Page: https://www.postgresql.org/docs/18/datatype-datetime.html
Description:
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-2M3DT-4H-5M-6S` while in reality there are no
dashes: `P1Y2M3DT4H5M6S`
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: INTERVAL output format for iso_8601 is without dashes
2026-03-10 14:10 INTERVAL output format for iso_8601 is without dashes PG Doc comments form <[email protected]>
@ 2026-03-15 20:14 ` Tom Lane <[email protected]>
2026-03-16 11:39 ` Re: INTERVAL output format for iso_8601 is without dashes Benjamin Kröger <[email protected]>
0 siblings, 1 reply; 4+ messages in thread
From: Tom Lane @ 2026-03-15 20:14 UTC (permalink / raw)
To: [email protected]; +Cc: [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-2M3DT-4H-5M-6S` while in reality there are no
> dashes: `P1Y2M3DT4H5M6S`
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
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: INTERVAL output format for iso_8601 is without dashes
2026-03-10 14:10 INTERVAL output format for iso_8601 is without dashes PG Doc comments form <[email protected]>
2026-03-15 20:14 ` Re: INTERVAL output format for iso_8601 is without dashes Tom Lane <[email protected]>
@ 2026-03-16 11:39 ` Benjamin Kröger <[email protected]>
2026-03-16 13:44 ` Re: INTERVAL output format for iso_8601 is without dashes Tom Lane <[email protected]>
0 siblings, 1 reply; 4+ messages in thread
From: Benjamin Kröger @ 2026-03-16 11:39 UTC (permalink / raw)
To: Tom Lane <[email protected]>; +Cc: [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-2M3DT-4H-5M-6S` while in reality there are no
>> dashes: `P1Y2M3DT4H5M6S`
>
> 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)
>
well, judging vom the columns `Year-Month Interval` and `Day-Time
Interval` I didn't expect the input for the column `Mixed Interval` to
have negative dimensions (since the other two are positive dimensions
only). granted, I missed the positive three days :)
It might help to see the input values that led to the documented output
values. If you look e.g. at the mixed interval output for style
`postgres_verbose`, all dimensions are signed exactly opposite to the
`iso_8601` style.
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: INTERVAL output format for iso_8601 is without dashes
2026-03-10 14:10 INTERVAL output format for iso_8601 is without dashes PG Doc comments form <[email protected]>
2026-03-15 20:14 ` Re: INTERVAL output format for iso_8601 is without dashes Tom Lane <[email protected]>
2026-03-16 11:39 ` Re: INTERVAL output format for iso_8601 is without dashes Benjamin Kröger <[email protected]>
@ 2026-03-16 13:44 ` Tom Lane <[email protected]>
0 siblings, 0 replies; 4+ messages in thread
From: Tom Lane @ 2026-03-16 13:44 UTC (permalink / raw)
To: Benjamin Kröger <[email protected]>; +Cc: [email protected]
=?UTF-8?Q?Benjamin_Kr=C3=B6ger?= <[email protected]> writes:
> It might help to see the input values that led to the documented output
> values. If you look e.g. at the mixed interval output for style
> `postgres_verbose`, all dimensions are signed exactly opposite to the
> `iso_8601` style.
I believe all the entries in each column of that table represent the
same value. The reason for the sign difference in postgres_verbose
is that it uses "ago" to indicate an overall sign inversion.
regards, tom lane
^ permalink raw reply [nested|flat] 4+ messages in thread
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2026-03-10 14:10 INTERVAL output format for iso_8601 is without dashes PG Doc comments form <[email protected]>
2026-03-15 20:14 ` Tom Lane <[email protected]>
2026-03-16 11:39 ` Benjamin Kröger <[email protected]>
2026-03-16 13:44 ` Tom Lane <[email protected]>
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