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How MySQL DATEDIFF() function works?

MySQL DATEDIFF() function returns the number of days between two dates. The syntax of this function is as follows −

DATEDIFF(date1,date2)

For example, if we want to know a number of days between dates say ‘2017-10-22’ and ‘2017-09-21’ then we can use DATEDIFF() function as follows −

mysql> Select DATEDIFF('2017-10-22','2017-09-21') AS 'NUMBER OF DAYS';

+----------------+
| NUMBER OF DAYS |
+----------------+
|            31  |
+----------------+
1 row in set (0.00 sec)