Accoding to the Proclamation no. 150 from Official Gazette April 23,2011 Black Saturday was declared by the president of the Philippines Benigno S. Aquino Jr. as a special non-working day (holiday) countrywide.
See the details below:
PROCLAMATION NO. 150
DECLARING SATURDAY, APRIL 23, 2011, AS A SPECIAL (NON-WORKING) DAY THROUGHOUT THE COUNTRY
WHEREAS, Saturday, April 23, 2011 falls between Good Friday and Easter Sunday;
WHEREAS, Black Saturday, falling between Good Friday and Easter Sunday, has been traditionally declared a special (non-working) day throughout the country;
WHEREAS, the observance of Holy Week is one of our people’s most cherished traditions;
WHEREAS, our people must be given the full and uninterrupted opportunity to ponder on the significance of the Holy Week and to properly observe its traditions with religious fervor, without prejudice to public interest.
NOW, THEREFORE, I, BENIGNO S. AQUINO III, President of the Philippines, by virtue of the powers vested in me by law, do hereby declare Saturday, April 23, 2011, as a special (non-working) day throughout the country.
IN WITNESS WHEREOF, I have hereunto set my hand and caused the seas of the Republic of the Philippines.
Done in the City of Manila, this 18th day of April, in the year of Our Lord Two Thousand and Eleven.
(Sgd.) BENIGNO S. AQUINO III
By the President:
(Sgd.) PAQUITO N. OCHOA JR.
*I got the details on Official Gazette website