Description:
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As per documentation (http://php.net/manual/en/intldateformatter.create.php), the default timezone (and the one used if NULL is given) is the one returned by date_default_timezone_get(). 

This is not the case however with IntlDateFormatter and PHP 5.4/5.3 - which seems to use system timezone instead of date_default_timezone_get().

PHP Version: PHP 5.4.16 / PHP 5.3.3
System timezone: GMT

Even though 5.3 and 5.4 are EOL - they are still widely used. Could this be at least explicitly stated in documentation (changelog section probably) ?

Test script:
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date_default_timezone_set("America/New_York");
$dateFormatter = new IntlDateFormatter('en_US', IntlDateFormatter::NONE, IntlDateFormatter::NONE);
$dateFormatter->setPattern('MM/dd/yy');
$parsed = $dateFormatter->parse("02/29/16");

var_dump(date("Y-m-d H:i:s", $parsed));


Expected result:
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"2016-02-29 00:00:00"

Actual result:
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"2016-02-28 19:00:00"