Historical clue formulations

• Nelson who wrote "Long Walk to Freedom" — 2022-08-22
• Peace Nobelist who went on to become president — 2019-10-20
• President in the 2009 film "Invictus" — 2018-11-29
• President who was imprisoned for 27 years — 2017-05-10
• 1993 Peace Prize sharer — 2014-07-05
• 1993 Peace Nobelist — 2012-10-24
• "Long Walk to Freedom" writer — 2008-11-26
• 1993 Peace Nobelist — 2006-04-25
• 1993 Peace Prize co-winner — 1999-10-02
• South African leader — 1997-11-05
• 1-Across's successor — 1996-05-11
• De Klerk's successor — 1995-04-28
• 1993 Peace Prizewinner — 1994-11-04