How can I return a DateTime object from its date to its epoch time?

I'm trying to find a way to find the true timestamp of the DateTime object I've already dressed down from a epoch moment. This has need of a trick or two to fully complete this bit of nonce code.

        do
        {
            $m = $n;
            echo "!!". $m->getTimestamp() ."\r\n";
            
            $m = date("zHisu",(int)$n->getTimestamp());
            $n = \DateTime::createFromFormat("zHisu", $m);
            $y++;
        } while ($y < 3);
        $y = 0;
        
        do
        {
            $m = $n;
            echo "!!". $m->getTimestamp() ."\r\n";
            
            $m = date("U",(int)$n->getTimestamp());
            $n = \DateTime::createFromFormat("U", $m);
            
            $y++;
        } while ($y < 3);

This is what comes out of the WSL PHP CLI I'm using. As I showed above, I'm simply getting a smaller number out of the larger one. "zHisu" (days, Hours, minutes, seconds, microseconds) I expected to use my second loop above to transpose the timestamp into a larger number, essentially getting this first number below from the ones below; in a singularity.\

Unfortunately it just comes back. I want to know if I should just take the time by my own self, and leave it be instead of working with the OOP, or does anyone have a fix for this?

*****31071534811253261

!!1661176061

!!1661176061

!!1661176061

!!1661176061

!!1661176061

!!1661176061

?????1661176061

source https://stackoverflow.com/questions/71651860/how-can-i-return-a-datetime-object-from-its-date-to-its-epoch-time