13 January

13 January was the thirteenth day of the year. (COMIC: Triskaidekaphobia)

Holidays
13 January was considered an unlucky day, at least in Britain. (COMIC: Triskaidekaphobia)

13 January was the annual Slitheen family reunion. (PROSE: Time Traveller's Diary)

Events
Escaping from the Speardroids, the Tenth Doctor and Rose Tyler, through use of the ineffective randomiser, arrived somewhere even more unlucky: on the 13th moon of the 13th planet of the 13th galaxy, on the 13th day of the 13th year of the 13th century, on a Friday. There, they were struck by lightning and rained on by cats, and they met the Triskaidekaphobes, considered the unluckiest people in the universe. Little did they know that this was for a reason: Bob Kreesus was extracting the moon's luck to make himself incredibly lucky. In the end, he was defeated by the Doctor, and, now no longer lucky, slipped on a banana peel and fell off a cliff. (COMIC: Triskaidekaphobia)

Behind the scenes
This was a reference to the fact that the comic story was featured in the thirteenth issue of Doctor Who Adventures. The story, in its entirety, was a reference to.