old_contents: # coding: utf-8
  from datetime import datetime
  
  
  def ping(msg=None, debug=False):
      ''' Ping the robot '''
      time_str = datetime.strftime('%m/%d %H:%M:%S')
      return u'pong (%s)' % time_str
  
new_contents: # coding: utf-8
  from datetime import datetime
  
  
  def ping(msg=None, debug=False):
      ''' Ping the robot '''
      time_str = datetime.strftime(datetime.now(), '%m/%d %H:%M:%S')
      return u'pong (%s)' % time_str
  
subject: Fix time formatting