Victorian Premier Henry Bolte announced the new name in a ceremony at the point on 20 April 1970 ( this was the 200th anniversary ; Cook 's 19 April was by nautical time , ie . not adjusted for the International Date Line ) . Victorian Premier Henry Bolte proclaimed the new name in a ceremony at the point on 20 April 1970 ( this was the 200th anniversary ; Cook 's 19 April was by nautical time , i.e. not adjusted for the International Date Line ) .