It's a non-working Philippine holiday on September 10 as the Palace declares it to give way for the festivities for Ramadan / Eid ul Fit’r or the end of the holy month of fasting by the Muslims.
Proclamation 26 was recently signed by the president Benigno Aquino III declaring September 10 as a non-working holiday. This is to enable our Muslim brothers to celebrate the 9th month of the Islamic calendar. It symbolizes purification after completing the fasting month of Ramadan.
For the non-Muslims, it would be a three-day long weekend from September 10 (Ramadan non-working holiday) to September 12.