将 T-SQL 的日期函数转换为 MySQL

Question

I am trying to convert this MS SQL Server code to MySQL but I am not getting the same date I would get in MS SQL Server. Does anyone know how to change this code to make it work in MySQL? The '2021-08-03 00:00:00' is a timestamp example being used.

SELECT
    FORMAT( DATEADD( DAY, 0, DATEDIFF( DAY, 0, '2021-08-03 00:00:00')), 'd', 'en-us' ) AS 'day'

The MYSQL Code so far.

SELECT FORMAT (adddate(datediff(NOW(), ma.Timestamp), INTERVAL 0 DAY), 'd', 'en-us') AS day,

Answer 1

Here's how to present dates in m/d/y format in MySQL:

CREATE TABLE `dates` (d datetime);

INSERT `dates`(d) VALUES('2021-08-31 03:00'),('2021-11-13 05:40');

SELECT DATE_FORMAT(d, '%c/%e/%Y') AS day FROM `dates`;

Results:

day
----------
8/31/2021
11/13/2021

• Example db<>fiddle

I knew nothing about this since I can barely spell MySQL, but looking up DATE_FORMAT() took about two minutes.

As an aside, the existing expression you got from your co-workers is both needlessly complex and a real drag on performance due to the FORMAT() function . Try:

DECLARE @d date = '2021-08-03T00:00:00.000';
SELECT CONVERT(char(10), @d, 101);

If you have a datetime already, that's fine, you can still strip time from it without all the dateadd and datediff noise:

DECLARE @d datetime = '2021-08-03T00:00:00.000';
SELECT CONVERT(char(10), @d, 101);

Not that I believe m/d/y is a sensible format in the first place, or that you should go out of your way to remove those leading zeroes...