18 September

18 September was a date.
In 150 million BC, Eldrad of Kastria was sentenced to death. He was cut into pieces and scattered across the universe. (PROSE: Time Traveller's Diary)
In 1909, the Tenth Doctor and Martha Jones departed the Lake District after defeating the Zygon warlord Brelarn's plan to assassinate King Edward VII. (PROSE: Sting of the Zygons)
In 1945, Albert Einstein was accidentally transported onboard the Eleventh Doctor's TARDIS while experimenting for his own time machine. After he was briefly turned into an Ood, the Doctor returned him to his own time. (TV: Death Is the Only Answer)