2540

In 2540, the Third Doctor and Jo Grant prevented the Master from fomenting war between the Earth Empire and the Draconian Empire. (DWN: Doctor Who and the Space War) They then defeated the Daleks' invasion plans on Spiridon. (DW: Planet of the Daleks)

Elsewhere, on 21st June, Bernice Summerfield was born, on Earth colony Beta Caprisis. (NA: Just War)

Behind the scenes
22.09.72.2540 is given as the time the Earth cargo ship C982 jumped into hyperspace at the beginning of DW: Frontier in Space and the Doctor tells Jo Grant that they are in the 26th century. 2540 is explicitly cited as the year in the novelisation and NA: Shadowmind. DW: Planet of the Daleks follows some time close to this point.

NA: Just War indicates that 25th century dates given in previous books for Bernice Summerfield's life were actually part of one of the other calendar systems in use in the Mutter's Spiral of her time. In another system, she was born in 2422. (NA: Falls the Shadow).