MySQL Date arithmetic

Example

NOW() + INTERVAL 1 DAY  -- This time tomorrow

CURDATE() - INTERVAL 4 DAY -- Midnight 4 mornings ago

Show the mysql questions stored that were asked 3 to 10 hours ago (180 to 600 minutes ago):

SELECT qId,askDate,minuteDiff  
FROM 
(   SELECT qId,askDate,
    TIMESTAMPDIFF(MINUTE,askDate,now()) as minuteDiff 
    FROM questions_mysql 
) xDerived 
WHERE minuteDiff BETWEEN 180 AND 600 
ORDER BY qId DESC 
LIMIT 50;

+----------+---------------------+------------+
| qId      | askDate             | minuteDiff |
+----------+---------------------+------------+
| 38546828 | 2016-07-23 22:06:50 |        182 |
| 38546733 | 2016-07-23 21:53:26 |        195 |
| 38546707 | 2016-07-23 21:48:46 |        200 |
| 38546687 | 2016-07-23 21:45:26 |        203 |
| ...      |                     |            |
+----------+---------------------+------------+

MySQL manual pages for TIMESTAMPDIFF().

Beware Do not try to use expressions like CURDATE() + 1 for date arithmetic in MySQL. They don't return what you expect, especially if you're accustomed to the Oracle database product. Use CURDATE() + INTERVAL 1 DAY instead.