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diff --git a/src/test/regress/sql/date.sql b/src/test/regress/sql/date.sql
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+--
+-- 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');
+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');
+
+SELECT f1 AS "Fifteen" FROM DATE_TBL;
+
+SELECT f1 AS "Nine" FROM DATE_TBL WHERE f1 < '2000-01-01';
+
+SELECT f1 AS "Three" FROM DATE_TBL
+ WHERE f1 BETWEEN '2000-01-01' AND '2001-01-01';
+
+--
+-- Check all the documented input formats
+--
+SET datestyle TO iso; -- display results in ISO
+
+SET datestyle TO ymd;
+
+SELECT date 'January 8, 1999';
+SELECT date '1999-01-08';
+SELECT date '1999-01-18';
+SELECT date '1/8/1999';
+SELECT date '1/18/1999';
+SELECT date '18/1/1999';
+SELECT date '01/02/03';
+SELECT date '19990108';
+SELECT date '990108';
+SELECT date '1999.008';
+SELECT date 'J2451187';
+SELECT date 'January 8, 99 BC';
+
+SELECT date '99-Jan-08';
+SELECT date '1999-Jan-08';
+SELECT date '08-Jan-99';
+SELECT date '08-Jan-1999';
+SELECT date 'Jan-08-99';
+SELECT date 'Jan-08-1999';
+SELECT date '99-08-Jan';
+SELECT date '1999-08-Jan';
+
+SELECT date '99 Jan 08';
+SELECT date '1999 Jan 08';
+SELECT date '08 Jan 99';
+SELECT date '08 Jan 1999';
+SELECT date 'Jan 08 99';
+SELECT date 'Jan 08 1999';
+SELECT date '99 08 Jan';
+SELECT date '1999 08 Jan';
+
+SELECT date '99-01-08';
+SELECT date '1999-01-08';
+SELECT date '08-01-99';
+SELECT date '08-01-1999';
+SELECT date '01-08-99';
+SELECT date '01-08-1999';
+SELECT date '99-08-01';
+SELECT date '1999-08-01';
+
+SELECT date '99 01 08';
+SELECT date '1999 01 08';
+SELECT date '08 01 99';
+SELECT date '08 01 1999';
+SELECT date '01 08 99';
+SELECT date '01 08 1999';
+SELECT date '99 08 01';
+SELECT date '1999 08 01';
+
+SET datestyle TO dmy;
+
+SELECT date 'January 8, 1999';
+SELECT date '1999-01-08';
+SELECT date '1999-01-18';
+SELECT date '1/8/1999';
+SELECT date '1/18/1999';
+SELECT date '18/1/1999';
+SELECT date '01/02/03';
+SELECT date '19990108';
+SELECT date '990108';
+SELECT date '1999.008';
+SELECT date 'J2451187';
+SELECT date 'January 8, 99 BC';
+
+SELECT date '99-Jan-08';
+SELECT date '1999-Jan-08';
+SELECT date '08-Jan-99';
+SELECT date '08-Jan-1999';
+SELECT date 'Jan-08-99';
+SELECT date 'Jan-08-1999';
+SELECT date '99-08-Jan';
+SELECT date '1999-08-Jan';
+
+SELECT date '99 Jan 08';
+SELECT date '1999 Jan 08';
+SELECT date '08 Jan 99';
+SELECT date '08 Jan 1999';
+SELECT date 'Jan 08 99';
+SELECT date 'Jan 08 1999';
+SELECT date '99 08 Jan';
+SELECT date '1999 08 Jan';
+
+SELECT date '99-01-08';
+SELECT date '1999-01-08';
+SELECT date '08-01-99';
+SELECT date '08-01-1999';
+SELECT date '01-08-99';
+SELECT date '01-08-1999';
+SELECT date '99-08-01';
+SELECT date '1999-08-01';
+
+SELECT date '99 01 08';
+SELECT date '1999 01 08';
+SELECT date '08 01 99';
+SELECT date '08 01 1999';
+SELECT date '01 08 99';
+SELECT date '01 08 1999';
+SELECT date '99 08 01';
+SELECT date '1999 08 01';
+
+SET datestyle TO mdy;
+
+SELECT date 'January 8, 1999';
+SELECT date '1999-01-08';
+SELECT date '1999-01-18';
+SELECT date '1/8/1999';
+SELECT date '1/18/1999';
+SELECT date '18/1/1999';
+SELECT date '01/02/03';
+SELECT date '19990108';
+SELECT date '990108';
+SELECT date '1999.008';
+SELECT date 'J2451187';
+SELECT date 'January 8, 99 BC';
+
+SELECT date '99-Jan-08';
+SELECT date '1999-Jan-08';
+SELECT date '08-Jan-99';
+SELECT date '08-Jan-1999';
+SELECT date 'Jan-08-99';
+SELECT date 'Jan-08-1999';
+SELECT date '99-08-Jan';
+SELECT date '1999-08-Jan';
+
+SELECT date '99 Jan 08';
+SELECT date '1999 Jan 08';
+SELECT date '08 Jan 99';
+SELECT date '08 Jan 1999';
+SELECT date 'Jan 08 99';
+SELECT date 'Jan 08 1999';
+SELECT date '99 08 Jan';
+SELECT date '1999 08 Jan';
+
+SELECT date '99-01-08';
+SELECT date '1999-01-08';
+SELECT date '08-01-99';
+SELECT date '08-01-1999';
+SELECT date '01-08-99';
+SELECT date '01-08-1999';
+SELECT date '99-08-01';
+SELECT date '1999-08-01';
+
+SELECT date '99 01 08';
+SELECT date '1999 01 08';
+SELECT date '08 01 99';
+SELECT date '08 01 1999';
+SELECT date '01 08 99';
+SELECT date '01 08 1999';
+SELECT date '99 08 01';
+SELECT date '1999 08 01';
+
+-- Check upper and lower limits of date range
+SELECT date '4714-11-24 BC';
+SELECT date '4714-11-23 BC'; -- out of range
+SELECT date '5874897-12-31';
+SELECT date '5874898-01-01'; -- out of range
+
+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;
+
+SELECT f1 - date 'epoch' AS "Days From Epoch" FROM DATE_TBL;
+
+SELECT date 'yesterday' - date 'today' AS "One day";
+
+SELECT date 'today' - date 'tomorrow' AS "One day";
+
+SELECT date 'yesterday' - date 'tomorrow' AS "Two days";
+
+SELECT date 'tomorrow' - date 'today' AS "One day";
+
+SELECT date 'today' - date 'yesterday' AS "One day";
+
+SELECT date 'tomorrow' - date 'yesterday' AS "Two days";
+
+--
+-- test extract!
+--
+-- epoch
+--
+SELECT EXTRACT(EPOCH FROM DATE '1970-01-01'); -- 0
+SELECT EXTRACT(EPOCH FROM TIMESTAMP '1970-01-01'); -- 0
+SELECT EXTRACT(EPOCH FROM TIMESTAMPTZ '1970-01-01+00'); -- 0
+--
+-- century
+--
+SELECT EXTRACT(CENTURY FROM DATE '0101-12-31 BC'); -- -2
+SELECT EXTRACT(CENTURY FROM DATE '0100-12-31 BC'); -- -1
+SELECT EXTRACT(CENTURY FROM DATE '0001-12-31 BC'); -- -1
+SELECT EXTRACT(CENTURY FROM DATE '0001-01-01'); -- 1
+SELECT EXTRACT(CENTURY FROM DATE '0001-01-01 AD'); -- 1
+SELECT EXTRACT(CENTURY FROM DATE '1900-12-31'); -- 19
+SELECT EXTRACT(CENTURY FROM DATE '1901-01-01'); -- 20
+SELECT EXTRACT(CENTURY FROM DATE '2000-12-31'); -- 20
+SELECT EXTRACT(CENTURY FROM DATE '2001-01-01'); -- 21
+SELECT EXTRACT(CENTURY FROM CURRENT_DATE)>=21 AS True; -- true
+--
+-- millennium
+--
+SELECT EXTRACT(MILLENNIUM FROM DATE '0001-12-31 BC'); -- -1
+SELECT EXTRACT(MILLENNIUM FROM DATE '0001-01-01 AD'); -- 1
+SELECT EXTRACT(MILLENNIUM FROM DATE '1000-12-31'); -- 1
+SELECT EXTRACT(MILLENNIUM FROM DATE '1001-01-01'); -- 2
+SELECT EXTRACT(MILLENNIUM FROM DATE '2000-12-31'); -- 2
+SELECT EXTRACT(MILLENNIUM FROM DATE '2001-01-01'); -- 3
+-- next test to be fixed on the turn of the next millennium;-)
+SELECT EXTRACT(MILLENNIUM FROM CURRENT_DATE); -- 3
+--
+-- decade
+--
+SELECT EXTRACT(DECADE FROM DATE '1994-12-25'); -- 199
+SELECT EXTRACT(DECADE FROM DATE '0010-01-01'); -- 1
+SELECT EXTRACT(DECADE FROM DATE '0009-12-31'); -- 0
+SELECT EXTRACT(DECADE FROM DATE '0001-01-01 BC'); -- 0
+SELECT EXTRACT(DECADE FROM DATE '0002-12-31 BC'); -- -1
+SELECT EXTRACT(DECADE FROM DATE '0011-01-01 BC'); -- -1
+SELECT EXTRACT(DECADE FROM DATE '0012-12-31 BC'); -- -2
+--
+-- some other types:
+--
+-- on a timestamp.
+SELECT EXTRACT(CENTURY FROM NOW())>=21 AS True; -- true
+SELECT EXTRACT(CENTURY FROM TIMESTAMP '1970-03-20 04:30:00.00000'); -- 20
+-- on an interval
+SELECT EXTRACT(CENTURY FROM INTERVAL '100 y'); -- 1
+SELECT EXTRACT(CENTURY FROM INTERVAL '99 y'); -- 0
+SELECT EXTRACT(CENTURY FROM INTERVAL '-99 y'); -- 0
+SELECT EXTRACT(CENTURY FROM INTERVAL '-100 y'); -- -1
+--
+-- test trunc function!
+--
+SELECT DATE_TRUNC('MILLENNIUM', TIMESTAMP '1970-03-20 04:30:00.00000'); -- 1001
+SELECT DATE_TRUNC('MILLENNIUM', DATE '1970-03-20'); -- 1001-01-01
+SELECT DATE_TRUNC('CENTURY', TIMESTAMP '1970-03-20 04:30:00.00000'); -- 1901
+SELECT DATE_TRUNC('CENTURY', DATE '1970-03-20'); -- 1901
+SELECT DATE_TRUNC('CENTURY', DATE '2004-08-10'); -- 2001-01-01
+SELECT DATE_TRUNC('CENTURY', DATE '0002-02-04'); -- 0001-01-01
+SELECT DATE_TRUNC('CENTURY', DATE '0055-08-10 BC'); -- 0100-01-01 BC
+SELECT DATE_TRUNC('DECADE', DATE '1993-12-25'); -- 1990-01-01
+SELECT DATE_TRUNC('DECADE', DATE '0004-12-25'); -- 0001-01-01 BC
+SELECT DATE_TRUNC('DECADE', DATE '0002-12-31 BC'); -- 0011-01-01 BC
+--
+-- test infinity
+--
+select 'infinity'::date, '-infinity'::date;
+select 'infinity'::date > 'today'::date as t;
+select '-infinity'::date < 'today'::date as t;
+select isfinite('infinity'::date), isfinite('-infinity'::date), isfinite('today'::date);
+--
+-- oscillating fields from non-finite date/timestamptz:
+--
+SELECT EXTRACT(HOUR FROM DATE 'infinity'); -- NULL
+SELECT EXTRACT(HOUR FROM DATE '-infinity'); -- NULL
+SELECT EXTRACT(HOUR FROM TIMESTAMP 'infinity'); -- NULL
+SELECT EXTRACT(HOUR FROM TIMESTAMP '-infinity'); -- NULL
+SELECT EXTRACT(HOUR FROM TIMESTAMPTZ 'infinity'); -- NULL
+SELECT EXTRACT(HOUR FROM TIMESTAMPTZ '-infinity'); -- NULL
+-- all possible fields
+SELECT EXTRACT(MICROSECONDS FROM DATE 'infinity'); -- NULL
+SELECT EXTRACT(MILLISECONDS FROM DATE 'infinity'); -- NULL
+SELECT EXTRACT(SECOND FROM DATE 'infinity'); -- NULL
+SELECT EXTRACT(MINUTE FROM DATE 'infinity'); -- NULL
+SELECT EXTRACT(HOUR FROM DATE 'infinity'); -- NULL
+SELECT EXTRACT(DAY FROM DATE 'infinity'); -- NULL
+SELECT EXTRACT(MONTH FROM DATE 'infinity'); -- NULL
+SELECT EXTRACT(QUARTER FROM DATE 'infinity'); -- NULL
+SELECT EXTRACT(WEEK FROM DATE 'infinity'); -- NULL
+SELECT EXTRACT(DOW FROM DATE 'infinity'); -- NULL
+SELECT EXTRACT(ISODOW FROM DATE 'infinity'); -- NULL
+SELECT EXTRACT(DOY FROM DATE 'infinity'); -- NULL
+SELECT EXTRACT(TIMEZONE FROM DATE 'infinity'); -- NULL
+SELECT EXTRACT(TIMEZONE_M FROM DATE 'infinity'); -- NULL
+SELECT EXTRACT(TIMEZONE_H FROM DATE 'infinity'); -- NULL
+--
+-- monotonic fields from non-finite date/timestamptz:
+--
+SELECT EXTRACT(EPOCH FROM DATE 'infinity'); -- Infinity
+SELECT EXTRACT(EPOCH FROM DATE '-infinity'); -- -Infinity
+SELECT EXTRACT(EPOCH FROM TIMESTAMP 'infinity'); -- Infinity
+SELECT EXTRACT(EPOCH FROM TIMESTAMP '-infinity'); -- -Infinity
+SELECT EXTRACT(EPOCH FROM TIMESTAMPTZ 'infinity'); -- Infinity
+SELECT EXTRACT(EPOCH FROM TIMESTAMPTZ '-infinity'); -- -Infinity
+-- all possible fields
+SELECT EXTRACT(YEAR FROM DATE 'infinity'); -- Infinity
+SELECT EXTRACT(DECADE FROM DATE 'infinity'); -- Infinity
+SELECT EXTRACT(CENTURY FROM DATE 'infinity'); -- Infinity
+SELECT EXTRACT(MILLENNIUM FROM DATE 'infinity'); -- Infinity
+SELECT EXTRACT(JULIAN FROM DATE 'infinity'); -- Infinity
+SELECT EXTRACT(ISOYEAR FROM DATE 'infinity'); -- Infinity
+SELECT EXTRACT(EPOCH FROM DATE 'infinity'); -- Infinity
+--
+-- wrong fields from non-finite date:
+--
+SELECT EXTRACT(MICROSEC FROM DATE 'infinity'); -- ERROR: timestamp units "microsec" not recognized
+
+-- test constructors
+select make_date(2013, 7, 15);
+select make_date(-44, 3, 15);
+select make_time(8, 20, 0.0);
+-- should fail
+select make_date(2013, 2, 30);
+select make_date(2013, 13, 1);
+select make_date(2013, 11, -1);
+select make_time(10, 55, 100.1);
+select make_time(24, 0, 2.1);
generated by cgit v1.2.3 (git 2.39.1) at 2025-02-06 22:53:26 +0000