2310

In 2310, Mestor threatened the universe by planning to explode Jaconda's sun, sending Gastropod eggs throughout the universe. The Sixth Doctor and Azmael stopped him. (TV: The Twin Dilemma)

Mars had been terraformed to the point where it had an Earth-type atmosphere, including the pollution, by this year. (PROSE: GodEngine)

Behind the scenes
Only the novelisation of the story gave the year, but this was later confirmed in AUDIO: Daleks Among Us.

2310