Following final action by the City Council, any necessary changes shall be made in the Zoning Map. A written record of the type and date of such change shall be maintained by the Zoning Administrator. Until such change is made, no action by the City Council on map amendments to the Zoning Ordinance shall be considered official, unless the Zoning Administrator fails to make the change within seven days after formal action by the City Council. In the latter event, action by the City Council shall be considered official seven days after the date of action even if the Zoning Administrator has failed to make the appropriate changes.