4 April

On Easter Sunday, 4 April 2009, Lady Christina de Souza stole the Cup of Athelstan from the International Gallery and made her getaway on a number 200 London bus, only to be unexpectedly transported to the planet of San Helios, by means of a wormhole, in the company of the Tenth Doctor. Eventually, the Doctor flew the damaged bus back through the wormhole, and Christina made her escape from the police on the now-flying bus. (TV: Planet of the Dead)

4 April 1938 was the date to which Rory Williams was transported whilst holding coffee he had bought in the 21st century. In the Manhattan of that date, he met his daughter and ultimately was reunited with his wife and the Eleventh Doctor. He then worked out that the only way to defeat the Weeping Angels that were feasting on the humans of this period was if he committed suicide, thus snapping the Angels' tether to the period. After he and Amy jumped off the Winter Quay building on this date, they found themselves back in the 21st century with the Angels mostly vanquished. (TV: The Angels Take Manhattan)