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postgresql/src/test/regress/expected/date.out
Bruce Momjian 46be0c18f1 > After all that about numbering centuries and millenia correctly, 
> why does CVS tip still give me
>
> regression=# select extract(century from now());
>  date_part
> -----------
>         20
> (1 row)
> [ ... looks in code ... ]
>
> Apparently it's because you fixed only timestamp_part, and not
> timestamptz_part.  I'm not too sure about what timestamp_trunc or
> timestamptz_trunc should do, but they may be wrong as well.

Sigh... as usual, what is not tested does not work:-(


> Could we have a more complete patch?

Please find a submission attached. I hope it really fixes all decade,
century and millenium issues for extract and *_trunc functions on
interval
and other timestamp types. If someone could check that the results
are reasonnable, it would be great.

I indeed overlooked the fact that there were two functions. The patch
fixes the code so that both variants agree.

I added comments to interval extractions, because it relies on the C
division to have a negative remainder: -7/10 = 0 and remains -7.

As for *_trunc functions, I have chosen to put the first year of the
century or millennium: -100, 1, 101... 1001 2001 etc. Indeed, I don't
think it would make sense to put 2000 (last year of the 2nd millennium)
for rounding all years of the third millenium.

I also fixed the code so that all decades last 10 years and decade 199
means the 1990's.

I have added some tests that are relevant to deal with tricky cases. The
formula may be simplified, but all these cases must pass. Please keep
them.

Fabien Coelho
2004-08-20 03:45:14 +00:00

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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');
ERROR: date/time field value out of range: "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;
Fifteen
------------
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
(15 rows)
SELECT f1 AS "Nine" FROM DATE_TBL WHERE f1 < '2000-01-01';
Nine
------------
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
(9 rows)
SELECT f1 AS "Three" FROM DATE_TBL
WHERE f1 BETWEEN '2000-01-01' AND '2001-01-01';
Three
------------
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"
HINT: Perhaps you need a different "datestyle" setting.
SELECT date '1/18/1999';
ERROR: date/time field value out of range: "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"
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"
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"
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"
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"
SELECT date '1999-08-Jan';
ERROR: invalid input syntax for type 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"
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"
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"
HINT: Perhaps you need a different "datestyle" setting.
SELECT date '08-01-1999';
ERROR: date/time field value out of range: "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"
HINT: Perhaps you need a different "datestyle" setting.
SELECT date '01-08-1999';
ERROR: date/time field value out of range: "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"
HINT: Perhaps you need a different "datestyle" setting.
SELECT date '08 01 1999';
ERROR: date/time field value out of range: "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"
HINT: Perhaps you need a different "datestyle" setting.
SELECT date '01 08 1999';
ERROR: date/time field value out of range: "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"
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"
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"
SELECT date '1999-08-Jan';
ERROR: invalid input syntax for type date: "1999-08-Jan"
SELECT date '99 Jan 08';
ERROR: date/time field value out of range: "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"
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"
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"
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"
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"
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"
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"
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"
SELECT date '1999-08-Jan';
ERROR: invalid input syntax for type date: "1999-08-Jan"
SELECT date '99 Jan 08';
ERROR: invalid input syntax for type 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"
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"
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"
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"
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"
HINT: Perhaps you need a different "datestyle" setting.
SELECT date '1999 08 01';
date
------------
1999-08-01
(1 row)
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
(15 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
(15 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!
--
-- century
--
SELECT EXTRACT(CENTURY FROM DATE '0101-12-31 BC'); -- -2
date_part
-----------
-2
(1 row)
SELECT EXTRACT(CENTURY FROM DATE '0100-12-31 BC'); -- -1
date_part
-----------
-1
(1 row)
SELECT EXTRACT(CENTURY FROM DATE '0001-12-31 BC'); -- -1
date_part
-----------
-1
(1 row)
SELECT EXTRACT(CENTURY FROM DATE '0001-01-01'); -- 1
date_part
-----------
1
(1 row)
SELECT EXTRACT(CENTURY FROM DATE '0001-01-01 AD'); -- 1
date_part
-----------
1
(1 row)
SELECT EXTRACT(CENTURY FROM DATE '1900-12-31'); -- 19
date_part
-----------
19
(1 row)
SELECT EXTRACT(CENTURY FROM DATE '1901-01-01'); -- 20
date_part
-----------
20
(1 row)
SELECT EXTRACT(CENTURY FROM DATE '2000-12-31'); -- 20
date_part
-----------
20
(1 row)
SELECT EXTRACT(CENTURY FROM DATE '2001-01-01'); -- 21
date_part
-----------
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
date_part
-----------
-1
(1 row)
SELECT EXTRACT(MILLENNIUM FROM DATE '0001-01-01 AD'); -- 1
date_part
-----------
1
(1 row)
SELECT EXTRACT(MILLENNIUM FROM DATE '1000-12-31'); -- 1
date_part
-----------
1
(1 row)
SELECT EXTRACT(MILLENNIUM FROM DATE '1001-01-01'); -- 2
date_part
-----------
2
(1 row)
SELECT EXTRACT(MILLENNIUM FROM DATE '2000-12-31'); -- 2
date_part
-----------
2
(1 row)
SELECT EXTRACT(MILLENNIUM FROM DATE '2001-01-01'); -- 3
date_part
-----------
3
(1 row)
-- next test to be fixed on the turn of the next millennium;-)
SELECT EXTRACT(MILLENNIUM FROM CURRENT_DATE); -- 3
date_part
-----------
3
(1 row)
--
-- decade
--
SELECT EXTRACT(DECADE FROM DATE '1994-12-25'); -- 199
date_part
-----------
199
(1 row)
SELECT EXTRACT(DECADE FROM DATE '0010-01-01'); -- 1
date_part
-----------
1
(1 row)
SELECT EXTRACT(DECADE FROM DATE '0009-12-31'); -- 0
date_part
-----------
0
(1 row)
SELECT EXTRACT(DECADE FROM DATE '0001-01-01 BC'); -- 0
date_part
-----------
0
(1 row)
SELECT EXTRACT(DECADE FROM DATE '0002-12-31 BC'); -- -1
date_part
-----------
-1
(1 row)
SELECT EXTRACT(DECADE FROM DATE '0011-01-01 BC'); -- -1
date_part
-----------
-1
(1 row)
SELECT EXTRACT(DECADE FROM DATE '0012-12-31 BC'); -- -2
date_part
-----------
-2
(1 row)
--
-- some other types:
--
-- on a timestamp.
SELECT EXTRACT(CENTURY FROM NOW())>=21 AS True; -- true
true
------
t
(1 row)
SELECT EXTRACT(CENTURY FROM TIMESTAMP '1970-03-20 04:30:00.00000'); -- 20
date_part
-----------
20
(1 row)
-- on an interval
SELECT EXTRACT(CENTURY FROM INTERVAL '100 y'); -- 1
date_part
-----------
1
(1 row)
SELECT EXTRACT(CENTURY FROM INTERVAL '99 y'); -- 0
date_part
-----------
0
(1 row)
SELECT EXTRACT(CENTURY FROM INTERVAL '-99 y'); -- 0
date_part
-----------
0
(1 row)
SELECT EXTRACT(CENTURY FROM INTERVAL '-100 y'); -- -1
date_part
-----------
-1
(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)
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