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Fix AT TIME ZONE for timestamps without time zones:

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test=> select (CURRENT_DATE + '05:00'::time)::timestamp at time zone
	'Canada/Pacific';
	        timezone
	------------------------
	 2005-07-22 08:00:00-04
	(1 row)
This commit is contained in:
Bruce Momjian
2005-07-23 02:02:27 +00:00
parent 261026575d
commit 5ddeffb676
1 changed files with 12 additions and 5 deletions
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17
src/backend/utils/adt/timestamp.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/timestamp.c,v 1.142 2005/07/22 21:16:15 momjian Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/timestamp.c,v 1.143 2005/07/23 02:02:27 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -3922,10 +3922,14 @@ interval_part(PG_FUNCTION_ARGS)
}
/* timestamp_zone()
* Encode timestamp type with specified time zone.
* Returns timestamp with time zone, with the input
/* timestamp_zone()
* Encode timestamp type with specified time zone.
* Returns timestamp with time zone, with the input
* rotated from local time to the specified zone.
* This function is tricky because instead of shifting
* the time _to_ a new time zone, it sets the time to _be_
* the specified timezone. This requires trickery
* of double-subtracting the requested timezone offset.
*/
Datum
timestamp_zone(PG_FUNCTION_ARGS)
@ -3960,7 +3964,7 @@ timestamp_zone(PG_FUNCTION_ARGS)
/* Apply the timezone change */
if (timestamp2tm(timestamp, &tz, &tm, &fsec, NULL, tzp) != 0 ||
tm2timestamp(&tm, fsec, NULL, &result) != 0)
tm2timestamp(&tm, fsec, &tz, &result) != 0)
{
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
@ -3968,6 +3972,9 @@ timestamp_zone(PG_FUNCTION_ARGS)
tzname)));
PG_RETURN_NULL();
}
/* Must double-adjust for timezone */
result = dt2local(result, -tz);
PG_RETURN_TIMESTAMPTZ(result);
}