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MySQL | DATEDIFF method

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schedule Jul 1, 2022
Last updated
local_offer MySQL
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MySQL's DATEDIFF(~) method returns the days difference between two date or datetime values. (i.e. expr1 - expr2)

NOTE

Only the date portion of datetimes are used in the calculation.

Parameters

1. expr1 | date/datetime

A date/datetime to be subtracted from.

2. expr2 | date/datetime

A date/datetime to subtract.

Return value

The days difference between the input date/datetime values (expr1 - expr2).

Examples

Consider the following table about some students:

student_id

fname

lname

day_enrolled

age

username

1

Sky

Towner

2015-12-03

17

stowner1

2

Ben

Davis

2016-04-20

19

bdavis2

3

Travis

Apple

2018-08-14

18

tapple3

4

Arthur

David

2016-04-01

16

adavid4

5

Benjamin

Town

2014-01-01

17

btown5

The above sample table can be created using the code here.

Basic usage

To return number of days between today and date of enrollment of students:

SELECT fname, NOW(), DATEDIFF(NOW(), day_enrolled)
FROM students;
+----------+---------------------+-------------------------------+
| fname | NOW() | DATEDIFF(NOW(), day_enrolled) |
+----------+---------------------+-------------------------------+
| Sky | 2020-05-20 13:57:53 | 1630 |
| Ben | 2020-05-20 13:57:53 | 1491 |
| Travis | 2020-05-20 13:57:53 | 645 |
| Arthur | 2020-05-20 13:57:53 | 1510 |
| Benjamin | 2020-05-20 13:57:53 | 2331 |
+----------+---------------------+-------------------------------+

To return students who have been enrolled for more than 1500 days as of 16 April 2020:

SELECT fname, DATEDIFF('2020-04-16', day_enrolled)
FROM students
WHERE DATEDIFF('2020-04-16', day_enrolled) > 1500;
+----------+--------------------------------------+
| fname | DATEDIFF('2020-04-16', day_enrolled) |
+----------+--------------------------------------+
| Sky | 1596 |
| Benjamin | 2297 |
+----------+--------------------------------------+
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Published by Arthur Yanagisawa
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