DateTime convert from database

PHP
1

Hello everybody,

Could someone help me please ? I need to get this DateTime format ‘31-12-2015’ from this DateTime format ‘2015-12-31 23:59:59’.

I tried this code but it did not work.

        // $date1 = '2015-12-31 23:59:59';
        $date2 = DateTime::createFromFormat('d-m-Y H:i:s', $date1);
        $date2->format('d-m-Y');
        echo $date2