Description:
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PHP's DateTimeZone doesn't currently support the FET (Far Eastern European Time) timezone, which is a valid timezone since 2011 according to IANA: http://www.iana.org/time-zones/repository/releases/tzdata2013h.tar.gz

The only two major cities in there are Europe/Kaliningrad and Europe/Minsk. Even if PHP refuses to support it, it shouldn't output FET, when format "T" is used for timezone Europe/Kaliningrad.


Test script:
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<?php

$dateTimeZone = new DateTimeZone('Europe/Kaliningrad');
$dateTime = new DateTime('now', $dateTimeZone);
// will fail here, because FET timezone doesn't exist yet
new DateTimeZone($dateTime->format("T"));


Expected result:
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No exception thrown from PHP.

Actual result:
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PHP Fatal error:  Uncaught exception 'Exception' with message 'DateTimeZone::__construct(): Unknown or bad timezone (FET)' in /home/sofit/Downloads/php-5.4.21/test.php:5
Stack trace:
#0 /home/sofit/Downloads/php-5.4.21/test.php(5): DateTimeZone->__construct('FET')
#1 {main}
  thrown in /home/sofit/Downloads/php-5.4.21/test.php on line 5