function howManyTimesBetween(string $sentence): string
{
    if (!preg_match('/^(?<date1>\d{4}-\d{2}-\d{2}) and (?<date2>\d{4}-\d{2}-\d{2})$/', $sentence, $dates)) {
        return 'Your question is strange';
    }

    $dates = array_map('date_create', $dates);

    if ($dates['date1'] == $dates['date2']) {
        return 'Dates are equals';
    }

    $diff = $dates['date1']->diff($dates['date2']);

    $diffStrings = [$diff->format('%y year(s)'), $diff->format('%m month(s)'), $diff->format('%d day(s)')];
    $diffStrings = preg_grep('/^0/', $diffStrings, PREG_GREP_INVERT);
  
    return 'There are '.implode(', ', $diffStrings)." between $sentence";
}