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) .