Volunteers will spend 67 minutes on hundreds of community upliftment projects a minute for every year of his activism.
Ailing human rights icon Nelson Mandela is expected to be released from hospital after spending five weeks close to death battling a recurring lung infection.
Children in schools across South Africa will start their classes singing "Happy Birthday" to the former statesman.
Celebrities have committed to painting schools, handing out clothes to impoverished kids and countless similar projects.
The United Nations in 2010 declared the Nobel peace laureate's birthday Mandela Day to encourage people around the world to do just over an hour of good deeds.
(with agency inputs)