When does the timeshift take place in 2009?

The timeshift in 2009 occurs during the episode titled "The Waters of Mars" from the television series Doctor Who. In this episode, the Doctor arrives on Mars in the year 2059, where he encounters a colony facing imminent disaster. He experiences a significant moment of realization about fixed points in time, leading to a moral dilemma regarding intervention. The narrative explores themes of fate and the consequences of altering established timelines.