code: def infer(examples, alt_rules=None):
      
      date_classes = _tag_most_likely(examples)
  
      if alt_rules:
          date_classes = _apply_rewrites(date_classes, alt_rules)
      else:
          date_classes = _apply_rewrites(date_classes, RULES)
  
      date_string = ''
      for date_class in date_classes:
          date_string += date_class.directive
  
      return date_string
docs: Returns a datetime.strptime-compliant format string for parsing the *most likely* date format
      used in examples. examples is a list containing example date strings.