It is the same date as the one when they left the TARDIS.
In "Last of the Time Lords," what children's story does the show emulate to restore the Doctor's youth? I don't remember the whole serial's name (Utopia/The Sound of Drums/Last of the Time Lords).
That was another question from "behind the scenes", not from "inside the DOCTOR WHO universe". If it deals with the cast, the crew or the production side of the TV series, it is real world and is "behind the scenes".
What pseudonym did the Doctor use for the first time in THE WHEEL IN SPACE?