TO_DAYS( ) converts a date to the corresponding number of days : TO_DAYS « Date Time « SQL / MySQL






  1. SQL / MySQL
  2. Date Time
  3. TO_DAYS

TO_DAYS( ) converts a date to the corresponding number of days

    
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)








Related examples in the same category

1.TO_DAYS( ) can convert DATETIME or TIMESTAMP values to days, if you don't mind having it chop off the time par
2.If you pass TO_DAYS( ) a date-and-time value, it extracts the date part and discards the time.
3.Using two date-and-time values that lie a week apart
4.Calculating Intervals Between Dates
5.For an interval in weeks, do the same thing and divide the result by seven