Historical clue formulations

• Donald Duck, to his nephews — 2015-04-02
• Donald Duck, to his nephews — 2004-12-09
• Donald, to Dewey — 2004-07-21
• Donald Duck, to Dewey — 2003-08-09
• Donald Duck, to his nephews — 2001-10-06
• Donald, to Huey, Dewey or Louie — 1999-04-11
• Donald Duck, to Huey, Dewey and Louie — 1996-11-15