Hong Kong Ordinances

DISTRICT COUNCILS ORDINANCE - SECT 22

How long elected member is to hold office

(1) An elected member holds office for a period of 4 years beginning on 1
January next following the ordinary election in which the member was elected
and vacates office at the end of that period.

(2) A person elected to fill a vacancy caused by an elected
member's ("first elected member") office becoming vacant before the expiry of
the full term, holds office from the date on which the result of the
by-election at which the person was elected is declared and vacates office on
the day the first elected member would have vacated office had that member
served the full term.