Historical clue formulations

• Canadian P.M. Justin — 2022-08-15
• World leader who once worked as a bouncer and a snowboarding instructor — 2020-01-17
• P.M. who took office in 2015 — 2019-08-25
• "Doonesbury" cartoonist — 2011-10-07
• P.M. between Pearson and Clark — 2007-12-05
• Pearson's successor — 2002-08-16
• "Doonesbury" cartoonist — 2000-08-09