def get_temp_tag_for_repo_creation(self):
tag_date = self.tag_times_dict.get(REPO_CREATED_TAG_NAME, None)<EOL>if not tag_date:<EOL><INDENT>tag_name, tag_date = self.fetcher.fetch_repo_creation_date()<EOL>self.tag_times_dict[tag_name] = timestring_to_datetime(tag_date)<EOL><DEDENT>return REPO_CREATED_TAG_NAME<EOL>
If not already cached, fetch the creation date of the repo, cache it
and return the special value indicating the creation of the repo.

:rtype: str
:return: value indicating the creation