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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: Bad date external representation '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)
--
-- 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)
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