How to subtract hours from a datetime in MySQL?

Question

I get a datetime field, that\'s currently in the query as:

SELECT DATE_FORMAT(x.date_entered, \'%Y-%m-%d\') AS date FROM x ORDER BY date ASC

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Answer 1

mySQL has DATE_SUB():

SELECT DATE_SUB(column, INTERVAL 3 HOUR)....

but would it not be better to try and sort out the underlying time zone issue instead?

Answer 2

Assuming you have some timezone issue and know source and destination timezone, you could convert it like so

SELECT DATE_FORMAT(CONVERT_TZ(x.date_entered, 'UTC', 'Europe/Berlin'),
                   '%Y-%m-%d') AS date
FROM x ORDER BY date ASC;