Answers for "datetime add timestamp php"

add 1 day php datetime

$date = new DateTime('2000-01-01');
$date->add(new DateInterval('P1D'));

add seconds to datetime php

<?php 
$date = new DateTime();
echo $date->getTimestamp(). "<br>";
$date->add(new DateInterval('PT674165S')); // adds 674165 secs
echo $date->getTimestamp();
?>