dateDiffConvert
function dateDiffConvert($diff) {
$days = floor($diff / 86400);
$hour = gmdate('H', $diff);
$minutes = gmdate('i', $diff);
$second = gmdate('s', $diff);
$result = (intval($days) > 0 ? $days . ' д ' : '') . (intval($hour) > 0 ? $hour . ' ч ' : '') . (intval($minutes) > 0 ? $minutes . ' м ' : '') . $second . ' c ';
return $result;
}