Date minus 1 year?

Question

I\'ve got a date in this format:

2009-01-01

How do I return the same date but 1 year earlier?

Answer 1

On my website, to check if registering people is 18 years old, I simply used the following :

$legalAge = date('Y-m-d', strtotime('-18 year'));

After, only compare the the two dates.

Hope it could help someone.