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$date = new DateTime('2006-12-12 15:00');
$date->modify('+1 hour');
echo $date->format('Y-m-d'); // 2006-12-12 16:00
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<?php
$date = "2021-11-01 10:10:05";
$newDate = date('Y-m-d H:i:s', strtotime($date. ' + 3 hours'));
echo $newDate;
?>
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$minutes_to_add = 5;
$time = new DateTime('2011-11-17 05:05');
$time->add(new DateInterval('PT' . $minutes_to_add . 'M'));
$stamp = $time->format('Y-m-d H:i');