MySQL get the date n days ago as a timestamp

Question

In MySQL, how would I get a timestamp from, say 30 days ago?

Something like:

select now() - 30

The result should return a timestamp

Answer 1

You could use:

SELECT unix_timestamp(now()) - unix_timestamp(maketime(_,_,_));

For unix timestamps or:

SELECT addtime(now(),maketime(_,_,_));

For the standard MySQL date format.