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

Dates are nothing more than integers. Integer size are system dependent; i.e. 32 bit, 64 bit, etc.

In php integer size can be determined using the constant PHP_INT_SIZE, and maximum value using the constant PHP_INT_MAX

In mysql you can do something lke this: SELECT ~0 as max_bigint_unsigned