Php IntlDateFormatter fa_IR bug test

index.php

function formatMyDate($locale, $pattern, $year, $month, $day) {
  $timezone = new \DateTimeZone('Asia/Tehran');
  $dateTime = new \DateTime('now', $timezone);
  $dateTime->setDate($year, $month, $day);
  $timeStamp     = $dateTime->getTimestamp();
  $dateFormatter = new \IntlDateFormatter(
    $locale,
    \IntlDateFormatter::FULL,
    \IntlDateFormatter::FULL,
    $timezone,
    \IntlDateFormatter::TRADITIONAL,
    $pattern);
  return $dateFormatter->format($timeStamp);
}

    $en        = 'en_US';
    $persianEn = 'en_US@calendar=persian';
    $persianFa = 'fa_IR@calendar=persian';
    $persian   = 'fa_IR';

    $pattern1 = null;
    $pattern2 = 'Y/MM/d';

    print(formatMyDate($en, $pattern1, 2018, 3, 17)) . ' -> OK</br>';
    print(formatMyDate($en, $pattern2, 2018, 3, 17)) . ' -> OK</br>';

    print'</br>';

    print(formatMyDate($persianEn, $pattern1, 2018, 3, 17)) . ' -> OK</br>';
    print(formatMyDate($persianEn, $pattern2, 2018, 3, 17)) . ' -> OK</br>';

    print'</br>';

    print(formatMyDate($persian, $pattern1, 2018, 3, 17)) . ' -> OK</br>';
    print(formatMyDate($persian, $pattern2, 2018, 3, 17)) . ' -> NOT OK</br>';

    print'</br>';

    print(formatMyDate($persianFa, $pattern1, 2018, 3, 17)) . ' -> OK</br>';
    print(formatMyDate($persianFa, $pattern2, 2018, 3, 17)) . ' -> NOT OK</br>';
    print'</br>';
    print(formatMyDate($persianFa, $pattern2, 2018, 3, 15)) . ' -> OK</br>';
    print(formatMyDate($persianFa, $pattern2, 2018, 3, 16)) . ' -> OK</br>';
    print(formatMyDate($persianFa, $pattern2, 2018, 3, 17)) . ' -> NOT OK</br>';
    print(formatMyDate($persianFa, $pattern2, 2018, 3, 18)) . ' -> NOT OK</br>';
    print(formatMyDate($persianFa, $pattern2, 2018, 3, 19)) . ' -> NOT OK</br>';
    print(formatMyDate($persianFa, $pattern2, 2018, 3, 20)) . ' -> NOT OK</br>';
    print(formatMyDate($persianFa, $pattern2, 2018, 3, 21)) . ' -> OK</br>';
    print(formatMyDate($persianFa, $pattern2, 2018, 3, 22)) . ' -> OK</br>';