Description:
------------
strtotime() of years >2038 or <1900 does not work on 64 bit platforms, that should not have problems with those dates. The rest of php functions work properly with those extended dates.

Reproduce code:
---------------
On 64 bit platforms php date functions support greater range of dates. For exampe:

<?= date('d-m-Y',time()+31536000000) ?>
Returns:
3007-06-25

But strtotime does not work with those improved date ranges:

<?= date('Y-m-d',strtotime('3007-06-25')) ?>
Returns:
1970-01-01

I understand that output on 32 bit platforms, but on 64 bit should work as the rest of functions, and return a valid 64bit timestamp for dates >2038 or <1900.