code: def generate_unreleased_section(self):
          
          if not self.filtered_tags:
              return ""
          now = datetime.datetime.utcnow()
          now = now.replace(tzinfo=dateutil.tz.tzutc())
          head_tag = {"name": self.options.unreleased_label}
          self.tag_times_dict[head_tag["name"]] = now
          unreleased_log = self.generate_log_between_tags(
              self.filtered_tags[0], head_tag)
          return unreleased_log
docs: Generate log for unreleased closed issues.
  
          :rtype: str
          :return: Generated ready-to-add unreleased section.