Original: In the Gregorian calendar, it will be the 2013th year of the Common Era, or of Anno Domini; the 13th year of the 3rd millennium and of the 21st century; and the 4th of the 2010s decade.
Simplified: X-Men: The X-Men try to overthrow the dystopian rule of the robot Sentinels in the Days of Future Past storyline (/O1980/O).