Test Timezone Discrepancy

test_timezone.php

<?php 

$timezones = [
    'America/Nuuk',
    'Asia/Qostanay',
    'Europe/Kyiv',
    'Pacific/Kanton',
];

foreach ($timezones as $tz) {
    echo $tz . "\n";
    echo " - Present:   " . yn(testNewTimezonePresent($tz)) . "\n";
    echo " - Formatter: " . yn(testNewTimezoneSupportedByFormatter($tz)) . "\n";
}

function yn($v) {
    return $v ? 'Yes' : 'No';
}

function testNewTimezonePresent($tz) {
    return in_array($tz, timezone_identifiers_list());
}

function testNewTimezoneSupportedByFormatter($tz) {
    return !empty(\IntlDateFormatter::create('en_US' ,IntlDateFormatter::FULL, IntlDateFormatter::FULL, 'Europe/Kyiv', IntlDateFormatter::GREGORIAN));
}