In Singapore, if a public holiday falls on a Sunday (which is a standard rest day for a 5-day work week), the following Monday becomes a paid public holiday according to the Ministry of Manpower.
Key Rules
• Rest Day Substitution: Under the Holidays Act, if a gazetted public holiday falls on a Sunday, the next working day (Monday) is declared a public holiday in place of it.
• Working on the Holiday: If you are required to work on that Sunday or the substitute Monday, your employer must compensate you in accordance with employment regulations (such as an extra day's salary or time off in lieu).
* Look at last point above