code: def show_time(self, end=False):
          
          if self.time_label is None:
              return
  
          elapsed_time = time.monotonic() - self.t0
          # System time changed to past date, so reset start.
          if elapsed_time < 0:
              self.t0 = time.monotonic()
              elapsed_time = 0
          if elapsed_time > 24 * 3600:  # More than a day...!
              fmt = "%d %H:%M:%S"
          else:
              fmt = "%H:%M:%S"
          if end:
              color = "#AAAAAA"
          else:
              color = "#AA6655"
          text = "<span style=\'color: %s\'><b>%s" \
                 "</b></span>" % (color,
                                  time.strftime(fmt, time.gmtime(elapsed_time)))
          self.time_label.setText(text)
docs: Text to show in time_label.