-- -- 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