Description:
------------
The class IntlDateFormatter gives the wrong result, it affects the time from 00:00 AM to 01:00 AM in any timezone. Mybe other versions have the same bug.

Test script:
---------------
$time = strtotime("2018-08-10 04:00:00 UTC");
date_default_timezone_set("America/New_York");
echo date('Y-m-d H:i:s', $time), "\n";
$formatter = \IntlDateFormatter::create("en_US", NULL, NULL, "America/New_York");
echo $formatter->format($time), "\n";

Expected result:
----------------
2018-08-10 00:00:00
Friday, August 10, 2018 at 00:00:00 AM Eastern Daylight Time

Actual result:
--------------
2018-08-10 00:00:00
Friday, August 10, 2018 at 12:00:00 AM Eastern Daylight Time