$lang = $this->currentLanguage;
switch ($lang) {
    case 'nl':
        setlocale(LC_ALL, 'nl_NL');
        break;
    case 'fr':
        setlocale(LC_ALL, 'fr_FR');
        break;
    case 'en':
        setlocale(LC_ALL, 'en_EN');
        break;
}

<?php
$stbStartDate = utf8_encode(strftime('%d %b %Y', strtotime($teamBuilding->start_date)));
$stbEndDate = utf8_encode(strftime('%d %b %Y', strtotime($teamBuilding->end_date)));
?>