Singapore legislation
Section 8
of Holidays Act
Section 8
President may appoint special days to be observed as public holidays
The President may by notification in the Gazette or in such other manner as he thinks fit at any time appoint a special day to be observed as a public holiday in addition to or in substitution for any of the days mentioned in the Schedule, and thereupon this Act shall apply to that day in the same manner as if it were mentioned in the Schedule.