Laravel + Carbon difference between two dateTime column

gistfile1.txt

public function DurationOfTimesheet($timesheet_id, $output = null) {
		$time = $this->where('id', $timesheet_id)->first();

		if (empty($time)) {
			return "timesheet not found";
		} else {
			// dd($time->start);
			$start = Carbon::createFromFormat('Y-m-d H:i:s', $time->start);

			
			if (!(int) ($time->finish)) {
				$finish = Carbon::now();
				// we give them the current time

			} else {
			//or else if we have logged out we show the difference between the two columns
				$finish = Carbon::createFromFormat('Y-m-d H:i:s', $time->finish);
			}

			$difference = $start->diff($finish);
			if ($output == true) {
				return $difference;
			} else {
				$humanoutput = "";
				if ($difference->d) {
					$humanoutput .= $difference->d . " day(s), ";
				}
				if ($difference->h) {
					$humanoutput .= $difference->h . " hour(s), ";
				}
				if ($difference->i) {
					$humanoutput .= $difference->i . " min(s), ";
				}
				return rtrim($humanoutput, ', ');
			}
		}
		

	}