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diff --git a/src/test/regress/expected/date.out b/src/test/regress/expected/date.out
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+++ b/src/test/regress/expected/date.out
@@ -0,0 +1,1497 @@
+--
+-- DATE
+--
+CREATE TABLE DATE_TBL (f1 date);
+INSERT INTO DATE_TBL VALUES ('1957-04-09');
+INSERT INTO DATE_TBL VALUES ('1957-06-13');
+INSERT INTO DATE_TBL VALUES ('1996-02-28');
+INSERT INTO DATE_TBL VALUES ('1996-02-29');
+INSERT INTO DATE_TBL VALUES ('1996-03-01');
+INSERT INTO DATE_TBL VALUES ('1996-03-02');
+INSERT INTO DATE_TBL VALUES ('1997-02-28');
+INSERT INTO DATE_TBL VALUES ('1997-02-29');
+ERROR: date/time field value out of range: "1997-02-29"
+LINE 1: INSERT INTO DATE_TBL VALUES ('1997-02-29');
+ ^
+INSERT INTO DATE_TBL VALUES ('1997-03-01');
+INSERT INTO DATE_TBL VALUES ('1997-03-02');
+INSERT INTO DATE_TBL VALUES ('2000-04-01');
+INSERT INTO DATE_TBL VALUES ('2000-04-02');
+INSERT INTO DATE_TBL VALUES ('2000-04-03');
+INSERT INTO DATE_TBL VALUES ('2038-04-08');
+INSERT INTO DATE_TBL VALUES ('2039-04-09');
+INSERT INTO DATE_TBL VALUES ('2040-04-10');
+INSERT INTO DATE_TBL VALUES ('2040-04-10 BC');
+SELECT f1 FROM DATE_TBL;
+ f1
+---------------
+ 04-09-1957
+ 06-13-1957
+ 02-28-1996
+ 02-29-1996
+ 03-01-1996
+ 03-02-1996
+ 02-28-1997
+ 03-01-1997
+ 03-02-1997
+ 04-01-2000
+ 04-02-2000
+ 04-03-2000
+ 04-08-2038
+ 04-09-2039
+ 04-10-2040
+ 04-10-2040 BC
+(16 rows)
+
+SELECT f1 FROM DATE_TBL WHERE f1 < '2000-01-01';
+ f1
+---------------
+ 04-09-1957
+ 06-13-1957
+ 02-28-1996
+ 02-29-1996
+ 03-01-1996
+ 03-02-1996
+ 02-28-1997
+ 03-01-1997
+ 03-02-1997
+ 04-10-2040 BC
+(10 rows)
+
+SELECT f1 FROM DATE_TBL
+ WHERE f1 BETWEEN '2000-01-01' AND '2001-01-01';
+ f1
+------------
+ 04-01-2000
+ 04-02-2000
+ 04-03-2000
+(3 rows)
+
+--
+-- Check all the documented input formats
+--
+SET datestyle TO iso; -- display results in ISO
+SET datestyle TO ymd;
+SELECT date 'January 8, 1999';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '1999-01-08';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '1999-01-18';
+ date
+------------
+ 1999-01-18
+(1 row)
+
+SELECT date '1/8/1999';
+ERROR: date/time field value out of range: "1/8/1999"
+LINE 1: SELECT date '1/8/1999';
+ ^
+HINT: Perhaps you need a different "datestyle" setting.
+SELECT date '1/18/1999';
+ERROR: date/time field value out of range: "1/18/1999"
+LINE 1: SELECT date '1/18/1999';
+ ^
+HINT: Perhaps you need a different "datestyle" setting.
+SELECT date '18/1/1999';
+ERROR: date/time field value out of range: "18/1/1999"
+LINE 1: SELECT date '18/1/1999';
+ ^
+HINT: Perhaps you need a different "datestyle" setting.
+SELECT date '01/02/03';
+ date
+------------
+ 2001-02-03
+(1 row)
+
+SELECT date '19990108';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '990108';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '1999.008';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date 'J2451187';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date 'January 8, 99 BC';
+ERROR: date/time field value out of range: "January 8, 99 BC"
+LINE 1: SELECT date 'January 8, 99 BC';
+ ^
+HINT: Perhaps you need a different "datestyle" setting.
+SELECT date '99-Jan-08';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '1999-Jan-08';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '08-Jan-99';
+ERROR: date/time field value out of range: "08-Jan-99"
+LINE 1: SELECT date '08-Jan-99';
+ ^
+HINT: Perhaps you need a different "datestyle" setting.
+SELECT date '08-Jan-1999';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date 'Jan-08-99';
+ERROR: date/time field value out of range: "Jan-08-99"
+LINE 1: SELECT date 'Jan-08-99';
+ ^
+HINT: Perhaps you need a different "datestyle" setting.
+SELECT date 'Jan-08-1999';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '99-08-Jan';
+ERROR: invalid input syntax for type date: "99-08-Jan"
+LINE 1: SELECT date '99-08-Jan';
+ ^
+SELECT date '1999-08-Jan';
+ERROR: invalid input syntax for type date: "1999-08-Jan"
+LINE 1: SELECT date '1999-08-Jan';
+ ^
+SELECT date '99 Jan 08';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '1999 Jan 08';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '08 Jan 99';
+ERROR: date/time field value out of range: "08 Jan 99"
+LINE 1: SELECT date '08 Jan 99';
+ ^
+HINT: Perhaps you need a different "datestyle" setting.
+SELECT date '08 Jan 1999';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date 'Jan 08 99';
+ERROR: date/time field value out of range: "Jan 08 99"
+LINE 1: SELECT date 'Jan 08 99';
+ ^
+HINT: Perhaps you need a different "datestyle" setting.
+SELECT date 'Jan 08 1999';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '99 08 Jan';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '1999 08 Jan';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '99-01-08';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '1999-01-08';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '08-01-99';
+ERROR: date/time field value out of range: "08-01-99"
+LINE 1: SELECT date '08-01-99';
+ ^
+HINT: Perhaps you need a different "datestyle" setting.
+SELECT date '08-01-1999';
+ERROR: date/time field value out of range: "08-01-1999"
+LINE 1: SELECT date '08-01-1999';
+ ^
+HINT: Perhaps you need a different "datestyle" setting.
+SELECT date '01-08-99';
+ERROR: date/time field value out of range: "01-08-99"
+LINE 1: SELECT date '01-08-99';
+ ^
+HINT: Perhaps you need a different "datestyle" setting.
+SELECT date '01-08-1999';
+ERROR: date/time field value out of range: "01-08-1999"
+LINE 1: SELECT date '01-08-1999';
+ ^
+HINT: Perhaps you need a different "datestyle" setting.
+SELECT date '99-08-01';
+ date
+------------
+ 1999-08-01
+(1 row)
+
+SELECT date '1999-08-01';
+ date
+------------
+ 1999-08-01
+(1 row)
+
+SELECT date '99 01 08';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '1999 01 08';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '08 01 99';
+ERROR: date/time field value out of range: "08 01 99"
+LINE 1: SELECT date '08 01 99';
+ ^
+HINT: Perhaps you need a different "datestyle" setting.
+SELECT date '08 01 1999';
+ERROR: date/time field value out of range: "08 01 1999"
+LINE 1: SELECT date '08 01 1999';
+ ^
+HINT: Perhaps you need a different "datestyle" setting.
+SELECT date '01 08 99';
+ERROR: date/time field value out of range: "01 08 99"
+LINE 1: SELECT date '01 08 99';
+ ^
+HINT: Perhaps you need a different "datestyle" setting.
+SELECT date '01 08 1999';
+ERROR: date/time field value out of range: "01 08 1999"
+LINE 1: SELECT date '01 08 1999';
+ ^
+HINT: Perhaps you need a different "datestyle" setting.
+SELECT date '99 08 01';
+ date
+------------
+ 1999-08-01
+(1 row)
+
+SELECT date '1999 08 01';
+ date
+------------
+ 1999-08-01
+(1 row)
+
+SET datestyle TO dmy;
+SELECT date 'January 8, 1999';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '1999-01-08';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '1999-01-18';
+ date
+------------
+ 1999-01-18
+(1 row)
+
+SELECT date '1/8/1999';
+ date
+------------
+ 1999-08-01
+(1 row)
+
+SELECT date '1/18/1999';
+ERROR: date/time field value out of range: "1/18/1999"
+LINE 1: SELECT date '1/18/1999';
+ ^
+HINT: Perhaps you need a different "datestyle" setting.
+SELECT date '18/1/1999';
+ date
+------------
+ 1999-01-18
+(1 row)
+
+SELECT date '01/02/03';
+ date
+------------
+ 2003-02-01
+(1 row)
+
+SELECT date '19990108';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '990108';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '1999.008';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date 'J2451187';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date 'January 8, 99 BC';
+ date
+---------------
+ 0099-01-08 BC
+(1 row)
+
+SELECT date '99-Jan-08';
+ERROR: date/time field value out of range: "99-Jan-08"
+LINE 1: SELECT date '99-Jan-08';
+ ^
+HINT: Perhaps you need a different "datestyle" setting.
+SELECT date '1999-Jan-08';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '08-Jan-99';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '08-Jan-1999';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date 'Jan-08-99';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date 'Jan-08-1999';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '99-08-Jan';
+ERROR: invalid input syntax for type date: "99-08-Jan"
+LINE 1: SELECT date '99-08-Jan';
+ ^
+SELECT date '1999-08-Jan';
+ERROR: invalid input syntax for type date: "1999-08-Jan"
+LINE 1: SELECT date '1999-08-Jan';
+ ^
+SELECT date '99 Jan 08';
+ERROR: date/time field value out of range: "99 Jan 08"
+LINE 1: SELECT date '99 Jan 08';
+ ^
+HINT: Perhaps you need a different "datestyle" setting.
+SELECT date '1999 Jan 08';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '08 Jan 99';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '08 Jan 1999';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date 'Jan 08 99';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date 'Jan 08 1999';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '99 08 Jan';
+ERROR: invalid input syntax for type date: "99 08 Jan"
+LINE 1: SELECT date '99 08 Jan';
+ ^
+SELECT date '1999 08 Jan';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '99-01-08';
+ERROR: date/time field value out of range: "99-01-08"
+LINE 1: SELECT date '99-01-08';
+ ^
+HINT: Perhaps you need a different "datestyle" setting.
+SELECT date '1999-01-08';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '08-01-99';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '08-01-1999';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '01-08-99';
+ date
+------------
+ 1999-08-01
+(1 row)
+
+SELECT date '01-08-1999';
+ date
+------------
+ 1999-08-01
+(1 row)
+
+SELECT date '99-08-01';
+ERROR: date/time field value out of range: "99-08-01"
+LINE 1: SELECT date '99-08-01';
+ ^
+HINT: Perhaps you need a different "datestyle" setting.
+SELECT date '1999-08-01';
+ date
+------------
+ 1999-08-01
+(1 row)
+
+SELECT date '99 01 08';
+ERROR: date/time field value out of range: "99 01 08"
+LINE 1: SELECT date '99 01 08';
+ ^
+HINT: Perhaps you need a different "datestyle" setting.
+SELECT date '1999 01 08';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '08 01 99';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '08 01 1999';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '01 08 99';
+ date
+------------
+ 1999-08-01
+(1 row)
+
+SELECT date '01 08 1999';
+ date
+------------
+ 1999-08-01
+(1 row)
+
+SELECT date '99 08 01';
+ERROR: date/time field value out of range: "99 08 01"
+LINE 1: SELECT date '99 08 01';
+ ^
+HINT: Perhaps you need a different "datestyle" setting.
+SELECT date '1999 08 01';
+ date
+------------
+ 1999-08-01
+(1 row)
+
+SET datestyle TO mdy;
+SELECT date 'January 8, 1999';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '1999-01-08';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '1999-01-18';
+ date
+------------
+ 1999-01-18
+(1 row)
+
+SELECT date '1/8/1999';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '1/18/1999';
+ date
+------------
+ 1999-01-18
+(1 row)
+
+SELECT date '18/1/1999';
+ERROR: date/time field value out of range: "18/1/1999"
+LINE 1: SELECT date '18/1/1999';
+ ^
+HINT: Perhaps you need a different "datestyle" setting.
+SELECT date '01/02/03';
+ date
+------------
+ 2003-01-02
+(1 row)
+
+SELECT date '19990108';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '990108';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '1999.008';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date 'J2451187';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date 'January 8, 99 BC';
+ date
+---------------
+ 0099-01-08 BC
+(1 row)
+
+SELECT date '99-Jan-08';
+ERROR: date/time field value out of range: "99-Jan-08"
+LINE 1: SELECT date '99-Jan-08';
+ ^
+HINT: Perhaps you need a different "datestyle" setting.
+SELECT date '1999-Jan-08';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '08-Jan-99';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '08-Jan-1999';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date 'Jan-08-99';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date 'Jan-08-1999';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '99-08-Jan';
+ERROR: invalid input syntax for type date: "99-08-Jan"
+LINE 1: SELECT date '99-08-Jan';
+ ^
+SELECT date '1999-08-Jan';
+ERROR: invalid input syntax for type date: "1999-08-Jan"
+LINE 1: SELECT date '1999-08-Jan';
+ ^
+SELECT date '99 Jan 08';
+ERROR: invalid input syntax for type date: "99 Jan 08"
+LINE 1: SELECT date '99 Jan 08';
+ ^
+SELECT date '1999 Jan 08';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '08 Jan 99';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '08 Jan 1999';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date 'Jan 08 99';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date 'Jan 08 1999';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '99 08 Jan';
+ERROR: invalid input syntax for type date: "99 08 Jan"
+LINE 1: SELECT date '99 08 Jan';
+ ^
+SELECT date '1999 08 Jan';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '99-01-08';
+ERROR: date/time field value out of range: "99-01-08"
+LINE 1: SELECT date '99-01-08';
+ ^
+HINT: Perhaps you need a different "datestyle" setting.
+SELECT date '1999-01-08';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '08-01-99';
+ date
+------------
+ 1999-08-01
+(1 row)
+
+SELECT date '08-01-1999';
+ date
+------------
+ 1999-08-01
+(1 row)
+
+SELECT date '01-08-99';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '01-08-1999';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '99-08-01';
+ERROR: date/time field value out of range: "99-08-01"
+LINE 1: SELECT date '99-08-01';
+ ^
+HINT: Perhaps you need a different "datestyle" setting.
+SELECT date '1999-08-01';
+ date
+------------
+ 1999-08-01
+(1 row)
+
+SELECT date '99 01 08';
+ERROR: date/time field value out of range: "99 01 08"
+LINE 1: SELECT date '99 01 08';
+ ^
+HINT: Perhaps you need a different "datestyle" setting.
+SELECT date '1999 01 08';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '08 01 99';
+ date
+------------
+ 1999-08-01
+(1 row)
+
+SELECT date '08 01 1999';
+ date
+------------
+ 1999-08-01
+(1 row)
+
+SELECT date '01 08 99';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '01 08 1999';
+ date
+------------
+ 1999-01-08
+(1 row)
+
+SELECT date '99 08 01';
+ERROR: date/time field value out of range: "99 08 01"
+LINE 1: SELECT date '99 08 01';
+ ^
+HINT: Perhaps you need a different "datestyle" setting.
+SELECT date '1999 08 01';
+ date
+------------
+ 1999-08-01
+(1 row)
+
+-- Check upper and lower limits of date range
+SELECT date '4714-11-24 BC';
+ date
+---------------
+ 4714-11-24 BC
+(1 row)
+
+SELECT date '4714-11-23 BC'; -- out of range
+ERROR: date out of range: "4714-11-23 BC"
+LINE 1: SELECT date '4714-11-23 BC';
+ ^
+SELECT date '5874897-12-31';
+ date
+---------------
+ 5874897-12-31
+(1 row)
+
+SELECT date '5874898-01-01'; -- out of range
+ERROR: date out of range: "5874898-01-01"
+LINE 1: SELECT date '5874898-01-01';
+ ^
+RESET datestyle;
+--
+-- Simple math
+-- Leave most of it for the horology tests
+--
+SELECT f1 - date '2000-01-01' AS "Days From 2K" FROM DATE_TBL;
+ Days From 2K
+--------------
+ -15607
+ -15542
+ -1403
+ -1402
+ -1401
+ -1400
+ -1037
+ -1036
+ -1035
+ 91
+ 92
+ 93
+ 13977
+ 14343
+ 14710
+ -1475115
+(16 rows)
+
+SELECT f1 - date 'epoch' AS "Days From Epoch" FROM DATE_TBL;
+ Days From Epoch
+-----------------
+ -4650
+ -4585
+ 9554
+ 9555
+ 9556
+ 9557
+ 9920
+ 9921
+ 9922
+ 11048
+ 11049
+ 11050
+ 24934
+ 25300
+ 25667
+ -1464158
+(16 rows)
+
+SELECT date 'yesterday' - date 'today' AS "One day";
+ One day
+---------
+ -1
+(1 row)
+
+SELECT date 'today' - date 'tomorrow' AS "One day";
+ One day
+---------
+ -1
+(1 row)
+
+SELECT date 'yesterday' - date 'tomorrow' AS "Two days";
+ Two days
+----------
+ -2
+(1 row)
+
+SELECT date 'tomorrow' - date 'today' AS "One day";
+ One day
+---------
+ 1
+(1 row)
+
+SELECT date 'today' - date 'yesterday' AS "One day";
+ One day
+---------
+ 1
+(1 row)
+
+SELECT date 'tomorrow' - date 'yesterday' AS "Two days";
+ Two days
+----------
+ 2
+(1 row)
+
+--
+-- test extract!
+--
+SELECT f1 as "date",
+ date_part('year', f1) AS year,
+ date_part('month', f1) AS month,
+ date_part('day', f1) AS day,
+ date_part('quarter', f1) AS quarter,
+ date_part('decade', f1) AS decade,
+ date_part('century', f1) AS century,
+ date_part('millennium', f1) AS millennium,
+ date_part('isoyear', f1) AS isoyear,
+ date_part('week', f1) AS week,
+ date_part('dow', f1) AS dow,
+ date_part('isodow', f1) AS isodow,
+ date_part('doy', f1) AS doy,
+ date_part('julian', f1) AS julian,
+ date_part('epoch', f1) AS epoch
+ FROM date_tbl;
+ date | year | month | day | quarter | decade | century | millennium | isoyear | week | dow | isodow | doy | julian | epoch
+---------------+-------+-------+-----+---------+--------+---------+------------+---------+------+-----+--------+-----+---------+---------------
+ 04-09-1957 | 1957 | 4 | 9 | 2 | 195 | 20 | 2 | 1957 | 15 | 2 | 2 | 99 | 2435938 | -401760000
+ 06-13-1957 | 1957 | 6 | 13 | 2 | 195 | 20 | 2 | 1957 | 24 | 4 | 4 | 164 | 2436003 | -396144000
+ 02-28-1996 | 1996 | 2 | 28 | 1 | 199 | 20 | 2 | 1996 | 9 | 3 | 3 | 59 | 2450142 | 825465600
+ 02-29-1996 | 1996 | 2 | 29 | 1 | 199 | 20 | 2 | 1996 | 9 | 4 | 4 | 60 | 2450143 | 825552000
+ 03-01-1996 | 1996 | 3 | 1 | 1 | 199 | 20 | 2 | 1996 | 9 | 5 | 5 | 61 | 2450144 | 825638400
+ 03-02-1996 | 1996 | 3 | 2 | 1 | 199 | 20 | 2 | 1996 | 9 | 6 | 6 | 62 | 2450145 | 825724800
+ 02-28-1997 | 1997 | 2 | 28 | 1 | 199 | 20 | 2 | 1997 | 9 | 5 | 5 | 59 | 2450508 | 857088000
+ 03-01-1997 | 1997 | 3 | 1 | 1 | 199 | 20 | 2 | 1997 | 9 | 6 | 6 | 60 | 2450509 | 857174400
+ 03-02-1997 | 1997 | 3 | 2 | 1 | 199 | 20 | 2 | 1997 | 9 | 0 | 7 | 61 | 2450510 | 857260800
+ 04-01-2000 | 2000 | 4 | 1 | 2 | 200 | 20 | 2 | 2000 | 13 | 6 | 6 | 92 | 2451636 | 954547200
+ 04-02-2000 | 2000 | 4 | 2 | 2 | 200 | 20 | 2 | 2000 | 13 | 0 | 7 | 93 | 2451637 | 954633600
+ 04-03-2000 | 2000 | 4 | 3 | 2 | 200 | 20 | 2 | 2000 | 14 | 1 | 1 | 94 | 2451638 | 954720000
+ 04-08-2038 | 2038 | 4 | 8 | 2 | 203 | 21 | 3 | 2038 | 14 | 4 | 4 | 98 | 2465522 | 2154297600
+ 04-09-2039 | 2039 | 4 | 9 | 2 | 203 | 21 | 3 | 2039 | 14 | 6 | 6 | 99 | 2465888 | 2185920000
+ 04-10-2040 | 2040 | 4 | 10 | 2 | 204 | 21 | 3 | 2040 | 15 | 2 | 2 | 101 | 2466255 | 2217628800
+ 04-10-2040 BC | -2040 | 4 | 10 | 2 | -204 | -21 | -3 | -2040 | 15 | 1 | 1 | 100 | 976430 | -126503251200
+(16 rows)
+
+--
+-- epoch
+--
+SELECT EXTRACT(EPOCH FROM DATE '1970-01-01'); -- 0
+ extract
+---------
+ 0
+(1 row)
+
+--
+-- century
+--
+SELECT EXTRACT(CENTURY FROM DATE '0101-12-31 BC'); -- -2
+ extract
+---------
+ -2
+(1 row)
+
+SELECT EXTRACT(CENTURY FROM DATE '0100-12-31 BC'); -- -1
+ extract
+---------
+ -1
+(1 row)
+
+SELECT EXTRACT(CENTURY FROM DATE '0001-12-31 BC'); -- -1
+ extract
+---------
+ -1
+(1 row)
+
+SELECT EXTRACT(CENTURY FROM DATE '0001-01-01'); -- 1
+ extract
+---------
+ 1
+(1 row)
+
+SELECT EXTRACT(CENTURY FROM DATE '0001-01-01 AD'); -- 1
+ extract
+---------
+ 1
+(1 row)
+
+SELECT EXTRACT(CENTURY FROM DATE '1900-12-31'); -- 19
+ extract
+---------
+ 19
+(1 row)
+
+SELECT EXTRACT(CENTURY FROM DATE '1901-01-01'); -- 20
+ extract
+---------
+ 20
+(1 row)
+
+SELECT EXTRACT(CENTURY FROM DATE '2000-12-31'); -- 20
+ extract
+---------
+ 20
+(1 row)
+
+SELECT EXTRACT(CENTURY FROM DATE '2001-01-01'); -- 21
+ extract
+---------
+ 21
+(1 row)
+
+SELECT EXTRACT(CENTURY FROM CURRENT_DATE)>=21 AS True; -- true
+ true
+------
+ t
+(1 row)
+
+--
+-- millennium
+--
+SELECT EXTRACT(MILLENNIUM FROM DATE '0001-12-31 BC'); -- -1
+ extract
+---------
+ -1
+(1 row)
+
+SELECT EXTRACT(MILLENNIUM FROM DATE '0001-01-01 AD'); -- 1
+ extract
+---------
+ 1
+(1 row)
+
+SELECT EXTRACT(MILLENNIUM FROM DATE '1000-12-31'); -- 1
+ extract
+---------
+ 1
+(1 row)
+
+SELECT EXTRACT(MILLENNIUM FROM DATE '1001-01-01'); -- 2
+ extract
+---------
+ 2
+(1 row)
+
+SELECT EXTRACT(MILLENNIUM FROM DATE '2000-12-31'); -- 2
+ extract
+---------
+ 2
+(1 row)
+
+SELECT EXTRACT(MILLENNIUM FROM DATE '2001-01-01'); -- 3
+ extract
+---------
+ 3
+(1 row)
+
+-- next test to be fixed on the turn of the next millennium;-)
+SELECT EXTRACT(MILLENNIUM FROM CURRENT_DATE); -- 3
+ extract
+---------
+ 3
+(1 row)
+
+--
+-- decade
+--
+SELECT EXTRACT(DECADE FROM DATE '1994-12-25'); -- 199
+ extract
+---------
+ 199
+(1 row)
+
+SELECT EXTRACT(DECADE FROM DATE '0010-01-01'); -- 1
+ extract
+---------
+ 1
+(1 row)
+
+SELECT EXTRACT(DECADE FROM DATE '0009-12-31'); -- 0
+ extract
+---------
+ 0
+(1 row)
+
+SELECT EXTRACT(DECADE FROM DATE '0001-01-01 BC'); -- 0
+ extract
+---------
+ 0
+(1 row)
+
+SELECT EXTRACT(DECADE FROM DATE '0002-12-31 BC'); -- -1
+ extract
+---------
+ -1
+(1 row)
+
+SELECT EXTRACT(DECADE FROM DATE '0011-01-01 BC'); -- -1
+ extract
+---------
+ -1
+(1 row)
+
+SELECT EXTRACT(DECADE FROM DATE '0012-12-31 BC'); -- -2
+ extract
+---------
+ -2
+(1 row)
+
+--
+-- all possible fields
+--
+SELECT EXTRACT(MICROSECONDS FROM DATE '2020-08-11');
+ERROR: date units "microseconds" not supported
+SELECT EXTRACT(MILLISECONDS FROM DATE '2020-08-11');
+ERROR: date units "milliseconds" not supported
+SELECT EXTRACT(SECOND FROM DATE '2020-08-11');
+ERROR: date units "second" not supported
+SELECT EXTRACT(MINUTE FROM DATE '2020-08-11');
+ERROR: date units "minute" not supported
+SELECT EXTRACT(HOUR FROM DATE '2020-08-11');
+ERROR: date units "hour" not supported
+SELECT EXTRACT(DAY FROM DATE '2020-08-11');
+ extract
+---------
+ 11
+(1 row)
+
+SELECT EXTRACT(MONTH FROM DATE '2020-08-11');
+ extract
+---------
+ 8
+(1 row)
+
+SELECT EXTRACT(YEAR FROM DATE '2020-08-11');
+ extract
+---------
+ 2020
+(1 row)
+
+SELECT EXTRACT(YEAR FROM DATE '2020-08-11 BC');
+ extract
+---------
+ -2020
+(1 row)
+
+SELECT EXTRACT(DECADE FROM DATE '2020-08-11');
+ extract
+---------
+ 202
+(1 row)
+
+SELECT EXTRACT(CENTURY FROM DATE '2020-08-11');
+ extract
+---------
+ 21
+(1 row)
+
+SELECT EXTRACT(MILLENNIUM FROM DATE '2020-08-11');
+ extract
+---------
+ 3
+(1 row)
+
+SELECT EXTRACT(ISOYEAR FROM DATE '2020-08-11');
+ extract
+---------
+ 2020
+(1 row)
+
+SELECT EXTRACT(ISOYEAR FROM DATE '2020-08-11 BC');
+ extract
+---------
+ -2020
+(1 row)
+
+SELECT EXTRACT(QUARTER FROM DATE '2020-08-11');
+ extract
+---------
+ 3
+(1 row)
+
+SELECT EXTRACT(WEEK FROM DATE '2020-08-11');
+ extract
+---------
+ 33
+(1 row)
+
+SELECT EXTRACT(DOW FROM DATE '2020-08-11');
+ extract
+---------
+ 2
+(1 row)
+
+SELECT EXTRACT(DOW FROM DATE '2020-08-16');
+ extract
+---------
+ 0
+(1 row)
+
+SELECT EXTRACT(ISODOW FROM DATE '2020-08-11');
+ extract
+---------
+ 2
+(1 row)
+
+SELECT EXTRACT(ISODOW FROM DATE '2020-08-16');
+ extract
+---------
+ 7
+(1 row)
+
+SELECT EXTRACT(DOY FROM DATE '2020-08-11');
+ extract
+---------
+ 224
+(1 row)
+
+SELECT EXTRACT(TIMEZONE FROM DATE '2020-08-11');
+ERROR: date units "timezone" not supported
+SELECT EXTRACT(TIMEZONE_M FROM DATE '2020-08-11');
+ERROR: date units "timezone_m" not supported
+SELECT EXTRACT(TIMEZONE_H FROM DATE '2020-08-11');
+ERROR: date units "timezone_h" not supported
+SELECT EXTRACT(EPOCH FROM DATE '2020-08-11');
+ extract
+------------
+ 1597104000
+(1 row)
+
+SELECT EXTRACT(JULIAN FROM DATE '2020-08-11');
+ extract
+---------
+ 2459073
+(1 row)
+
+--
+-- test trunc function!
+--
+SELECT DATE_TRUNC('MILLENNIUM', TIMESTAMP '1970-03-20 04:30:00.00000'); -- 1001
+ date_trunc
+--------------------------
+ Thu Jan 01 00:00:00 1001
+(1 row)
+
+SELECT DATE_TRUNC('MILLENNIUM', DATE '1970-03-20'); -- 1001-01-01
+ date_trunc
+------------------------------
+ Thu Jan 01 00:00:00 1001 PST
+(1 row)
+
+SELECT DATE_TRUNC('CENTURY', TIMESTAMP '1970-03-20 04:30:00.00000'); -- 1901
+ date_trunc
+--------------------------
+ Tue Jan 01 00:00:00 1901
+(1 row)
+
+SELECT DATE_TRUNC('CENTURY', DATE '1970-03-20'); -- 1901
+ date_trunc
+------------------------------
+ Tue Jan 01 00:00:00 1901 PST
+(1 row)
+
+SELECT DATE_TRUNC('CENTURY', DATE '2004-08-10'); -- 2001-01-01
+ date_trunc
+------------------------------
+ Mon Jan 01 00:00:00 2001 PST
+(1 row)
+
+SELECT DATE_TRUNC('CENTURY', DATE '0002-02-04'); -- 0001-01-01
+ date_trunc
+------------------------------
+ Mon Jan 01 00:00:00 0001 PST
+(1 row)
+
+SELECT DATE_TRUNC('CENTURY', DATE '0055-08-10 BC'); -- 0100-01-01 BC
+ date_trunc
+---------------------------------
+ Tue Jan 01 00:00:00 0100 PST BC
+(1 row)
+
+SELECT DATE_TRUNC('DECADE', DATE '1993-12-25'); -- 1990-01-01
+ date_trunc
+------------------------------
+ Mon Jan 01 00:00:00 1990 PST
+(1 row)
+
+SELECT DATE_TRUNC('DECADE', DATE '0004-12-25'); -- 0001-01-01 BC
+ date_trunc
+---------------------------------
+ Sat Jan 01 00:00:00 0001 PST BC
+(1 row)
+
+SELECT DATE_TRUNC('DECADE', DATE '0002-12-31 BC'); -- 0011-01-01 BC
+ date_trunc
+---------------------------------
+ Mon Jan 01 00:00:00 0011 PST BC
+(1 row)
+
+--
+-- test infinity
+--
+select 'infinity'::date, '-infinity'::date;
+ date | date
+----------+-----------
+ infinity | -infinity
+(1 row)
+
+select 'infinity'::date > 'today'::date as t;
+ t
+---
+ t
+(1 row)
+
+select '-infinity'::date < 'today'::date as t;
+ t
+---
+ t
+(1 row)
+
+select isfinite('infinity'::date), isfinite('-infinity'::date), isfinite('today'::date);
+ isfinite | isfinite | isfinite
+----------+----------+----------
+ f | f | t
+(1 row)
+
+--
+-- oscillating fields from non-finite date:
+--
+SELECT EXTRACT(DAY FROM DATE 'infinity'); -- NULL
+ extract
+---------
+
+(1 row)
+
+SELECT EXTRACT(DAY FROM DATE '-infinity'); -- NULL
+ extract
+---------
+
+(1 row)
+
+-- all supported fields
+SELECT EXTRACT(DAY FROM DATE 'infinity'); -- NULL
+ extract
+---------
+
+(1 row)
+
+SELECT EXTRACT(MONTH FROM DATE 'infinity'); -- NULL
+ extract
+---------
+
+(1 row)
+
+SELECT EXTRACT(QUARTER FROM DATE 'infinity'); -- NULL
+ extract
+---------
+
+(1 row)
+
+SELECT EXTRACT(WEEK FROM DATE 'infinity'); -- NULL
+ extract
+---------
+
+(1 row)
+
+SELECT EXTRACT(DOW FROM DATE 'infinity'); -- NULL
+ extract
+---------
+
+(1 row)
+
+SELECT EXTRACT(ISODOW FROM DATE 'infinity'); -- NULL
+ extract
+---------
+
+(1 row)
+
+SELECT EXTRACT(DOY FROM DATE 'infinity'); -- NULL
+ extract
+---------
+
+(1 row)
+
+--
+-- monotonic fields from non-finite date:
+--
+SELECT EXTRACT(EPOCH FROM DATE 'infinity'); -- Infinity
+ extract
+----------
+ Infinity
+(1 row)
+
+SELECT EXTRACT(EPOCH FROM DATE '-infinity'); -- -Infinity
+ extract
+-----------
+ -Infinity
+(1 row)
+
+-- all supported fields
+SELECT EXTRACT(YEAR FROM DATE 'infinity'); -- Infinity
+ extract
+----------
+ Infinity
+(1 row)
+
+SELECT EXTRACT(DECADE FROM DATE 'infinity'); -- Infinity
+ extract
+----------
+ Infinity
+(1 row)
+
+SELECT EXTRACT(CENTURY FROM DATE 'infinity'); -- Infinity
+ extract
+----------
+ Infinity
+(1 row)
+
+SELECT EXTRACT(MILLENNIUM FROM DATE 'infinity'); -- Infinity
+ extract
+----------
+ Infinity
+(1 row)
+
+SELECT EXTRACT(JULIAN FROM DATE 'infinity'); -- Infinity
+ extract
+----------
+ Infinity
+(1 row)
+
+SELECT EXTRACT(ISOYEAR FROM DATE 'infinity'); -- Infinity
+ extract
+----------
+ Infinity
+(1 row)
+
+SELECT EXTRACT(EPOCH FROM DATE 'infinity'); -- Infinity
+ extract
+----------
+ Infinity
+(1 row)
+
+--
+-- wrong fields from non-finite date:
+--
+SELECT EXTRACT(MICROSEC FROM DATE 'infinity'); -- error
+ERROR: date units "microsec" not recognized
+-- test constructors
+select make_date(2013, 7, 15);
+ make_date
+------------
+ 07-15-2013
+(1 row)
+
+select make_date(-44, 3, 15);
+ make_date
+---------------
+ 03-15-0044 BC
+(1 row)
+
+select make_time(8, 20, 0.0);
+ make_time
+-----------
+ 08:20:00
+(1 row)
+
+-- should fail
+select make_date(0, 7, 15);
+ERROR: date field value out of range: 0-07-15
+select make_date(2013, 2, 30);
+ERROR: date field value out of range: 2013-02-30
+select make_date(2013, 13, 1);
+ERROR: date field value out of range: 2013-13-01
+select make_date(2013, 11, -1);
+ERROR: date field value out of range: 2013-11--1
+select make_time(10, 55, 100.1);
+ERROR: time field value out of range: 10:55:100.1
+select make_time(24, 0, 2.1);
+ERROR: time field value out of range: 24:00:2.1