The INTERVAL keyword works similarly to the NOW() and CURDATE() MySQL functions in that it can be used with time, date, or datetime units of a date value.
Using INTERVAL with MySQL NOW()
mysql> Select NOW() + INTERVAL 2 day; +------------------------+ | NOW() + INTERVAL 2 day | +------------------------+ | 2017-10-30 09:19:31 | +------------------------+ 1 row in set (0.00 sec) mysql> Select NOW() - INTERVAL 2 day; +------------------------+ | NOW() - INTERVAL 2 day | +------------------------+ | 2017-10-26 09:19:45 | +------------------------+ 1 row in set (0.00 sec) mysql> Select NOW() - INTERVAL 2 hour; +-------------------------+ | NOW() - INTERVAL 2 hour | +-------------------------+ | 2017-10-28 07:19:51 | +-------------------------+ 1 row in set (0.00 sec)
Using INTERVAL with MySQL CURDATE()
mysql> Select CURDATE() - INTERVAL 2 day; +----------------------------+ | CURDATE() - INTERVAL 2 day | +----------------------------+ | 2017-10-26 | +----------------------------+ 1 row in set (0.00 sec) mysql> Select CURDATE() + INTERVAL 2 day; +----------------------------+ | CURDATE() + INTERVAL 2 day | +----------------------------+ | 2017-10-30 | +----------------------------+ 1 row in set (0.00 sec)
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