When Does the Film “Watchmen” (2009) Take Place?
“Watchmen” is a political science fiction superhero film written by David Hayter with Alex Tse [adapting "Watchmen" (1986) by Alan Moore] that released March 6th, 2009. So when is "Watchmen" set?
It takes place in the year:
We know this because Rorschach’s journal excerpts are used as a voiceover narration device and he clearly reads aloud a date in October of 1985 AD near the beginning of the film and one in November near the end.

1985 AD
We know this because Rorschach’s journal excerpts are used as a voiceover narration device and he clearly reads aloud a date in October of 1985 AD near the beginning of the film and one in November near the end.
The final epilogue with a publisher and his assistant could be taking place in the new year but it's unclear how much time has passed since the climax.