$last_date = "2018-01-10 00:00:00";
$current_date = Carbon::now()->toDateTimeString();
//NUMBER DAYS BETWEEN TWO DATES CALCULATOR
$start_date = CarbonCarbon::createFromFormat('Y-m-d H:i:s', $last_date);
$end_date = CarbonCarbon::createFromFormat('Y-m-d H:i:s', $current_date);
$different_days = $start_date->diffInDays($end_date);