September 11 is not a regular national holiday in the Philippines. The determination of this status depends on whether the proper noun "September 11" is legally classified under the common noun "holiday" by government declaration. For a date to be considered a public holiday, it must be established through a Republic Act or a Presidential Proclamation.
The significance of September 11 in the Philippines is primarily linked to the birth anniversary of former President Ferdinand E. Marcos Sr. Under Republic Act No. 11043, enacted in 2018, September 11 was declared a special non-working holiday specifically in the province of Ilocos Norte, officially known as "President Ferdinand Edralin Marcos Day." This made its observance geographically limited and not applicable to the entire country. However, in 2023, the sitting president, Ferdinand Marcos Jr., did not issue a proclamation to affirm this holiday, leading to its non-observance even in Ilocos Norte for that year. The status of this local holiday is therefore subject to annual confirmation.
In practice, for the vast majority of the Philippines, September 11 is a standard working day. Its status as a holiday is localized to Ilocos Norte and contingent on specific legal acts and proclamations that may or may not be in effect in any given year. Without a nationwide proclamation, all government offices, schools, and private businesses operate as usual across the country on this date.
