diff options
Diffstat (limited to 'src/backend/utils/adt')
| -rw-r--r-- | src/backend/utils/adt/timestamp.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/backend/utils/adt/timestamp.c b/src/backend/utils/adt/timestamp.c index eb954847267..4b8d52ef7ba 100644 --- a/src/backend/utils/adt/timestamp.c +++ b/src/backend/utils/adt/timestamp.c @@ -4265,6 +4265,7 @@ date2isoweek(int year, int mon, int mday) /* date2isoyear() * * Returns ISO 8601 year number. + * Note: zero or negative results follow the year-zero-exists convention. */ int date2isoyear(int year, int mon, int mday) @@ -4539,6 +4540,9 @@ timestamp_part(PG_FUNCTION_ARGS) case DTK_ISOYEAR: result = date2isoyear(tm->tm_year, tm->tm_mon, tm->tm_mday); + /* Adjust BC years */ + if (result <= 0) + result -= 1; break; case DTK_DOW: @@ -4735,6 +4739,9 @@ timestamptz_part(PG_FUNCTION_ARGS) case DTK_ISOYEAR: result = date2isoyear(tm->tm_year, tm->tm_mon, tm->tm_mday); + /* Adjust BC years */ + if (result <= 0) + result -= 1; break; case DTK_DOW: |