Every year on 18 July — the day Nelson Mandela was born — the UN joins a call by the Nelson Mandela Foundation to devote 67 minutes of time to helping others, as a way to mark Nelson Mandela International Day.
For 67 years Nelson Mandela devoted his life to the service of humanity — as a human rights lawyer, a prisoner of conscience, an international peacemaker and the first democratically elected president of a free South Africa.
http://www.un.org/en/events/mandeladay/