17 May 1969: broadcast of fifth episode of The War Games. The Doctor infitrates the Chief Scientist’s laboratory, but Jamie’s raid on central control goes badly.
17 May 2008: broadcast of The Unicorn and the Wasp. The Doctor and Donna arrive at a house party in 1926 and, together with Agatha Christie, defeat the Vespiform.
I knew about the party skew, but I didn’t know about the geographic one.