To date, Guardians of the Galaxy has a worldwide gross of $752,640,000, which bests X-Men: Days Of Future Past's $746,045,700.
Guardians already passed X-Men domestically a while ago, with Guardians currently grossing a whopping $328,640,000 in the U.S.
X-men: Days Of Future Past stands at $233,921,534 in the U.S.
Some other relevant stats for Guardians of the Galaxy include:
The biggest movie of 2014 in the U.S.
Third best worldwide of 2014 (slightly trailing Maleficient, with Transformers 4 at #1)
Third best Marvel Studios movie (The Avengers and Iron Man 3 take #1 and #2)
Sixth biggest Marvel Comics movie in the U.S. (trailing Raimi Spider-Man movies, Iron Man 3 and The Avengers)
Considered the #2 superhero origin movie in the U.S. (trailing Raimi's Spider-Man)
Best opening weekend in August
(numbers via Amazon's Box Office Mojo)
Marvel has given Guardians of the Galaxy 2 a July 28, 2017 release date which sees James Gunn return to direct.
Watch: Guardians of the Galaxy Blu-Ray Trailer: