code: def last(conf):
      
      try:
          v2ex = V2ex(conf.config)
          v2ex.login()
          last_date = v2ex.get_last()
          click.echo(last_date)
      except KeyError:
          click.echo('Keyerror, please check your config file.')
      except IndexError:
          click.echo('Please check your username and password.')
docs: How long you have kept signing in.