I really liked "Ghost Country" by Patrick Lee. It's the second in a three book series, the first book being "The Breach" (also a very good action/adventure/sci-fi book, but no time travel in that one). The 3rd book in the series, "Deep Sky" has a bit of time travel type stuff in it. Ghost Country has more time travel, and was my favorite of the series.
"Departure" by A.G. Riddle was also very good. Action/adventure/sci-fi/time-travel.
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