DateConverter::findFirstOccurrence

static function findFirstOccurrence($haystack, $needle, $offset=0)
{
	$haystack = mb_substr($haystack, 0, 25 + $offset);
	if(!is_array($needle))
	{
		$needle = array($needle);
	}

	$positions = array();
	foreach($needle as $query)
	{
		$result = mb_strpos($haystack, $query, $offset);
		if ($result !== false)
		{
			$positions[] = $result;
		}
	}

	return empty($positions)? false: min($positions);
}