2493

2493 was the the year the UK-201, carrying Vicki Pallister and Bennett, left Earth. Vicki was ultimately bound for the planet Astra because her father had gotten a job there. (TV: The Rescue)

Elsewhere, Don Arco moved to the Justicia system. (PROSE: The Monsters Inside)

Alternate timeline
In a potential history shown by the Eleventh Doctor to Jean-Luc Picard, the Cybermen, having integrated both the Doctor's N-Space and Picard's parallel universe before conquering the Borg Collective, continued their campaign to convert the galaxy. The Judoon had been converted en masse to serve as Cyberman shock troopers by this year, mindlessly destroying everything in their path (COMIC: Assimilation²)

Behind the scenes
2493 is often cited as the year in which The Rescue takes place, but neither episode actually confirms this. In fact, Vicki takes pains in "Desperate Measures" to point out that she's been on Dido for a "long time". The situation is confused more by statements in PROSE: Byzantium!.