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Fix bogus timetz_zone() results for DYNTZ abbreviations.

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timetz_zone() delivered completely wrong answers if the zone was
specified by a dynamic TZ abbreviation, because it failed to account
for the difference between the POSIX conventions for field values in
struct pg_tm and the conventions used in PG-specific datetime code.

As a stopgap fix, just adjust the tm_year and tm_mon fields to match
PG conventions.  This is fixed in a different way in HEAD (388e71af8)
but I don't want to back-patch the change of reference point.

Discussion: https://postgr.es/m/CAJ7c6TOMG8zSNEZtCn5SPe+cCk3Lfxb71ZaQwT2F4T7PJ_t=KA@mail.gmail.com
This commit is contained in:
Tom Lane 2021-09-06 11:29:52 -04:00
parent 8782a84529
commit 90b4647f63
1 changed files with 2 additions and 0 deletions
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2
src/backend/utils/adt/date.c
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@ -2848,6 +2848,8 @@ timetz_zone(PG_FUNCTION_ARGS)
struct pg_tm *tm;
tm = pg_localtime(&now, tzp);
tm->tm_year += 1900; /* adjust to PG conventions */
tm->tm_mon += 1;
tz = DetermineTimeZoneAbbrevOffset(tm, tzname, tzp);
}
else