The BBC Press office and the doctor who website has offcial announced the Start time of the The DW Xmas special The Next doctor to be at 6:00pm (BWT) which will last for 1 hour so ending at 7:00pm(BWT)
Thursday 25 December 6.00-7.00pm
It's Christmas Eve in 1851 and Cybermen stalk the snow of Victorian London, in this special Christmas edition of Russell T Davies's Bafta Award-winning time-travelling drama.
When the Doctor arrives and starts to investigate a spate of mysterious deaths, he's surprised to meet another Doctor, and soon the two must combine forces to defeat the ruthless Miss Hartigan. But are two Doctors enough to stop the rise of the CyberKing?
David Tennant stars as The Doctor, David Morrissey as The Doctor and Dervla Kirwan as Miss Hartigan. This episode also features Velile Tshabalala as Rosita.
On the Official website they have a timer counting down to christmas: