Online PHP editor | refs for 5gXB8

<?php echo "Now: ", $now = strtotime("now"), "\n"; echo "Then: ", $then = strtotime("now -20 years"), "\n"; echo $now2 = strtotime("now +1 year"), "\n"; echo $then2 = strtotime("now -19 years"), "\n"; echo "Dif 1: ", ($now-$then) / 60 / 60, " hours\n"; echo "Dif 2: ", ($now2-$then2) / 60 / 60, " hours\n"; echo "Simple: ", 20*365*24, " hours\n";