Mega Code Archive
TO_DAYS( ) converts a date to the corresponding number of days
<![CDATA[
mysql>
mysql> CREATE TABLE date_val
-> (
-> d DATE
-> );
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql> INSERT INTO date_val (d) VALUES('1864-02-28');
Query OK, 1 row affected (0.00 sec)
mysql> INSERT INTO date_val (d) VALUES('1900-01-15');
Query OK, 1 row affected (0.00 sec)
mysql> INSERT INTO date_val (d) VALUES('1987-03-05');
Query OK, 1 row affected (0.00 sec)
mysql> INSERT INTO date_val (d) VALUES('1999-12-31');
Query OK, 1 row affected (0.00 sec)
mysql> INSERT INTO date_val (d) VALUES('2000-06-04');
Query OK, 1 row affected (0.00 sec)
mysql>
mysql>
mysql> SELECT d,
-> TO_DAYS(d) AS 'DATE to days',
-> FROM_DAYS(TO_DAYS(d)) AS 'DATE to days to DATE'
-> FROM date_val;
+------------+--------------+----------------------+
| d | DATE to days | DATE to days to DATE |
+------------+--------------+----------------------+
| 1864-02-28 | 680870 | 1864-02-28 |
| 1900-01-15 | 693975 | 1900-01-15 |
| 1987-03-05 | 725800 | 1987-03-05 |
| 1999-12-31 | 730484 | 1999-12-31 |
| 2000-06-04 | 730640 | 2000-06-04 |
+------------+--------------+----------------------+
5 rows in set (0.00 sec)
mysql>
mysql> drop table date_val;
Query OK, 0 rows affected (0.00 sec)
]]>