<?php

$tz = new DateTimezone('Europe/Berlin');

$dt = new DateTime();
$dt->setTimezone($tz);

echo '<b>available datetime formats</b>' . PHP_EOL;

echo $dt->format(DateTime::ATOM) . PHP_EOL;
echo $dt->format(DateTime::COOKIE) . PHP_EOL;
echo $dt->format(DateTime::RSS) . PHP_EOL;
echo $dt->format(DateTime::W3C) . PHP_EOL;

echo $dt->format(DateTime::ISO8601) . PHP_EOL;
echo $dt->format(DateTime::RFC822) . PHP_EOL;
echo $dt->format(DateTime::RFC850) . PHP_EOL;
echo $dt->format(DateTime::RFC1036) . PHP_EOL;
echo $dt->format(DateTime::RFC1123) . PHP_EOL;
echo $dt->format(DateTime::RFC2822) . PHP_EOL;
echo $dt->format(DateTime::RFC3339) . PHP_EOL . PHP_EOL;

echo '<b>create DateTime from a string with predefined format</b>' . PHP_EOL;

$dt = DateTime::createFromFormat(
    DateTime::RSS,
    'Sat, 04 Oct 2014 14:38:40 +0200'
);

var_dump($dt);



available datetime formats
2018-12-13T01:00:42+01:00
Thursday, 13-Dec-2018 01:00:42 CET
Thu, 13 Dec 2018 01:00:42 +0100
2018-12-13T01:00:42+01:00
2018-12-13T01:00:42+0100
Thu, 13 Dec 18 01:00:42 +0100
Thursday, 13-Dec-18 01:00:42 CET
Thu, 13 Dec 18 01:00:42 +0100
Thu, 13 Dec 2018 01:00:42 +0100
Thu, 13 Dec 2018 01:00:42 +0100
2018-12-13T01:00:42+01:00

create DateTime from a string with predefined format
object(DateTime)#384 (3) {
["date"]=>
string(26) "2014-10-04 14:38:40.000000"
["timezone_type"]=>
int(1)
["timezone"]=>
string(6) "+02:00"
}

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PHP 7.2, Zend 3.0, Symfony 4.0, Laravel 5.6, PHPUnit 6.5, Doctrine 2.8