This is just up!
According to the Goverment's Official Gazette's post on Twitter, the President has just signed Proclamation No. 150, today, declaring the Black Saturday, April 23, 2011 as a holiday - a special non-working day.
The announcement reads, "Saturday, April 23, 2011 has been declared a special (nonworking) day nationwide as per Proclamation No. 150, signed today."