Description:
------------
Anything before 12 31, 1901 will not produce output.

Reproduce code:
---------------
<?php 
// This will produce output.
echo mktime(0,0,0,12,31,1901);

// This will not.
echo mktime(0,0,0,1,1,1900);
?>


Expected result:
----------------
line 3 will display a timestamp with a negative value.
line 6 will display a timestamp with a negative value.

Actual result:
--------------
line 6 does not return a timestamp with a negative value.