php unix timestamp to date

<?php 
echo date('m/d/Y H:i:s', 1541843467); 
?> 

<?php
$timestamp=1333699439;
echo gmdate("Y-m-d\TH:i:s\Z", $timestamp);
?>

$date = new DateTime();
echo $date->getTimestamp();

<?php 
echo date('m/d/Y H:i:s', 1541843467); 
?>

$currentTime = DateTime::createFromFormat( 'U', $timestamp );