Adding years to a date resets to 1970-01-01

Question

$somedate = \"1980-02-15\";
$otherdate = strtotime(\'+1 year\', strtotime($somedate));
echo date(\'Y-m-d\', $otherdate);

outputs

19         


        

Answer 1

75 years from 1980 is 2055, which is past the highest date value that can be represented in a 32-bit integer. Therefore the result becomes 0, which is the 1970 date you observe.