[mysql] How to get the number of days of difference between two dates on mysql?

I need to get the number of days contained within a couple of dates on MySQL.

For example:

• Check in date is 12-04-2010
• Check out date 15-04-2010

The day difference would be 3

I prefer TIMESTAMPDIFF because you can easily change the unit if need be.

Use the DATEDIFF() function.

Example from documentation:

SELECT DATEDIFF('2007-12-31 23:59:59','2007-12-30');
    -> 1

Note if you want to count FULL 24h days between 2 dates, datediff can return wrong values for you.

As documentation states:

Only the date parts of the values are used in the calculation.

which results in

select datediff('2016-04-14 11:59:00', '2016-04-13 12:00:00')

returns 1 instead of expected 0.

Solution is using select timestampdiff(DAY, '2016-04-13 11:00:01', '2016-04-14 11:00:00'); (note the opposite order of arguments compared to datediff).

Some examples:

• select timestampdiff(DAY, '2016-04-13 11:00:01', '2016-04-14 11:00:00'); returns 0
• select timestampdiff(DAY, '2016-04-13 11:00:00', '2016-04-14 11:00:00'); returns 1
• select timestampdiff(DAY, '2016-04-13 11:00:00', now()); returns how many full 24h days has passed since 2016-04-13 11:00:00 until now.

Hope it will help someone, because at first it isn't much obvious why datediff returns values which seems to be unexpected or wrong.

SELECT md.*, DATEDIFF(md.end_date, md.start_date) AS days FROM  membership_dates md

output::

id  entity_id    start_date            end_date             days

1   1236      2018-01-16 00:00:00     2018-08-31 00:00:00    227
2   2876      2015-06-26 00:00:00     2019-06-30 00:00:00   1465
3   3880      1990-06-05 00:00:00     2018-07-04 00:00:00   10256
4   3882      1993-07-05 00:00:00     2018-07-04 00:00:00   9130

hope it helps someone in future

Get days between Current date to destination Date

 SELECT DATEDIFF('2019-04-12', CURDATE()) AS days;

output

days

 335