date-formatted-in-all-locales.php

<?php

$now = time();

$locales = `locale -a`;
$locales = preg_split('/\s/is', $locales);
//var_dump($locales); exit;

echo "<ul>";

foreach ($locales as $loc) {
    $loc = trim($loc);
    if (empty($loc)) {
        continue;
    }
    if (strpos($loc, '.') !== false) {
        continue;
    }
    setlocale(LC_ALL, $loc);
    $formattedDate = strftime('%x', $now);

    echo "<li>";
    echo $loc . ': <strong>' . $formattedDate . '</strong>';
    echo "</li>";
}

echo "</ul>";