All boards or commissions shall be appointed at such time, and for such term as shall be prescribed in this charter or in the ordinance or State statute creating such office. If any appointment shall not be made on the day specified in this charter or in the ordinance or statute creating such office, it may be made at any subsequent time. After confirming such appointment, it shall be the duty of the city clerk within five days to notify in writing by certified mail the person receiving such appointment.