Online PHP editor | output for e5OoW

<?php $date = strtotime('2014-01-15'); #$date = '2014-01-15'; echo date('Y-m-d',$date).PHP_EOL; $daysbefor1979 = '25568'; $start = strtotime("1900-01-01"); echo $start.PHP_EOL; $diff = ($date - $start); echo $diff.PHP_EOL; $days = ($diff / 86400); echo $days.PHP_EOL; /*echo date('Y-m-d', jdtounix(gregoriantojd(12, 31, 1899) + 41603)).PHP_EOL;*/ $erg = round(($daysbefor1979+$days), 0); echo 'erg: '.$erg.PHP_EOL; $days1 = round(($erg-$daysbefor1979), 0); echo $days1.PHP_EOL; $diff1 = ($days1*86400); echo $diff1.PHP_EOL; echo date('Y-m-d',$diff1).PHP_EOL; echo ($diff1+$start).PHP_EOL; echo date('Y-m-d',($diff1+$start)).PHP_EOL; echo PHP_EOL.PHP_EOL; $daysbefor1979 = '25568'; $start = strtotime("1900-01-01"); $zahl = $erg; echo date('Y-m-d',((($zahl-$daysbefor1979)*86400)+$start)).PHP_EOL; $d = new DateTime( '1900-01-01' ); $d->modify( '+41654 days' ); echo $d->format( 'Y-m-d' ), "\n";