$v = 1355711847;
echo $v.'<br>';
echo date("d.m.Y H:i:s",$v);
echo '<br>date_default_timezone_get:';
print_r(date_default_timezone_get());
echo '<br>';
$date = new DateTime("@$v");
echo $date->format('d.m.Y H:i');
echo '<br>$date->getTimezone():';
echo print_r($date->getTimezone()->getName());
echo '<br>';
echo $date->format('U');
echo '<br>**********';
$d =  new DateTime();
echo time().' ** '.$d->format('U');


echo '<br>-----------------------<br>';
//$date = new DateTime("@$v",new DateTimeZone('Europe/Moscow'));
$date->setTimezone(new DateTimeZone('Europe/Moscow'));

echo '<br>-';
echo print_r($date->getTimezone()->getName());
echo '<br># '.$date->format('d.m.Y H:i');