PHP and MySQL smallest and largest possible date

Question

What is the largest date PHP and MySQL recognizes?

I mean, I have different values for different timeline and I want to make them all as BETWEEN selects

Answer 1

MySQL's DATETIME type supports from "1000-01-01" to "9999-12-31". That should be sufficient.

PHP can analyze those as well; they aren't two digit years, so it's good. I just ran strtotime on 9999-01-01 and it worked.