def display_time(self, code):

       print(str(datetime.datetime.now()))

       frame = np.zeros([480, 640, 3])

       font = cv2.FONT_HERSHEY_SIMPLEX
       time_list = str(datetime.datetime.now()).split(' ')[1].split('.')
       text = time_list[0]
       datet = time_list[1]
       frame = cv2.putText(frame, text, (10, 100), font, 4,
                           (255, 255, 255), 2, cv2.LINE_AA)
       frame = cv2.putText(frame, datet, (10, 200), font, 4,
                           (255, 255, 255), 2, cv2.LINE_AA)
       frame = cv2.putText(frame, code, (10, 300), font, 4,
                           (255, 255, 255), 2, cv2.LINE_AA)
       cv2.imshow('frame', frame)
       cv2.moveWindow('frame', 0, 0)
       cv2.waitKey(1)
       print(str(datetime.datetime.now()))