About 12.4 million children were targeted to sing the
song specially composed for the Madiba. To give the celebration an added national touch, the Nelson Mandela Foundation has encouraged locals to devote 67 minutes of voluntary work on the day - to represent the 67 years he devoted to South Africa's political struggle.
"If a man could dedicate 67 years of his life to doing good for the world, imagine what we could achieve if everyone just gave 67 minutes of their time to do the same," said Said Achmat Dangor, the head of the foundation.
UN boss Ban Ki-moon has given his full support to the initiative.
“The best way we can thank Nelson Mandela for his work is by taking action for others and inspiring change,” the UN secretary-general said.
Madiba, as his clan name goes in the Rainbow Nation, will spend the day with his family in his home village of Qunu in the Eastern Cape.
Mandela has won several national and international awards throughout his life. Notable among them is the Nobel Peace Prize in 1993, which was shared with Frederik Willem de Klerk), the Order of Merit from, and creation as a Baliff Grand Cross of the Order of St. John by Queen Elizabeth II and the Presidential Medal of Freedom from George W. Bush
US president Barack Obama also joined others in wishing frail looking Mandela well on his happiest day on earth.
He described the local hero’s life and legacy as an epitome of "wisdom, strength and grace".
Mandela stood just a term as president and handed over to Thabo Mbeki in 1999. He spent 27 years in prison fighting for freedom in South Africa. He was released in 1990 and later led the African National Congress party to a landslide victory in 1994 - the first time South Africa's black majority was allowed to vote.
Mandela has not made any public outing since the closing ceremony of the football World Cup in July 2010 in South Africa.