How to print timestamp from MySQL + PHP?

Question

PHP

Good afternoon! There is a string in the MySQL database
And here is its value in the database itself:

When using the following code, the date will be 01.01.1970 03:00:00

$date = strtotime($existingInfo["RegisterDate"]);
echo date('d.m.Y H:i:s', $date);

I am using RedbeanPHP if that matters.
Question: How to correctly echo the date?

Answer 1

if($existingInfo["RegisterDate"])) {
    echo (new DateTimeImmutable($existingInfo["RegisterDate"]))->format('d.m.Y H:i:s');
}