how to get difference between two dates in mysql code example

Example 1: mysql date between two dates

ex1:
SELECT * FROM `objects` 
WHERE  (date_field BETWEEN '2010-01-30 14:15:55' AND '2010-09-29 10:15:55')

ex2:
WHERE 
   requireddate BETWEEN 
     CAST('2003-01-01' AS DATE) AND 
     CAST('2003-01-31' AS DATE);

Example 2: mysql query dates between two dates

select * from users 
where signup_date between '2020-05-01' and '2020-12-10 23:59:59';
// Important with the times, 
// otherwize you will not get all records from end date.
// Event if you only have date and no times in signup_date column

Example 3: mysql compare work days

5 * (DATEDIFF(@E, @S) DIV 7) + MID('0123444401233334012222340111123400001234000123440', 7 * WEEKDAY(@S) + WEEKDAY(@E) + 1, 1)