$start_Date='2016-06-02 18:00:13';
$end_Date='2016-06-06 18:00:13';
$start = Carbon::parse($start_Date);
$end = Carbon::parse($end_Date);
$now = Carbon::now();
$length = $start->diffInDays($now);
$lengthFromEnd = $end->diffInDays($now);

$difference = $start_date->diff($end_date)->days;

$start_Date='2016-06-02 18:00:13';
$end_Date='2016-06-06 18:00:13';

$absolute = false;
$end->diffInDays($now, $absoute);