Historical clue formulations

• Fruit in an often-parodied William Carlos Williams poem — 2019-10-20
• They're often cross-bred with apricots — 2017-10-29
• Prunes, originally — 2011-08-01
• Juicy fruits — 2008-01-14
• Prunes, once — 2005-11-15
• Brandy base — 1998-06-27