Quite true. I've known Calvinists who are pre-Trib, mid-trib, post-Trib, PreMil (and dispy PreMil), AMil, and PostMil. While I would personally argue that the here-and-now portions of Calvinistic theology (covenant-keeping, etc)are at odds with some eschatological views (esp. the PreMil "the church is destined to lose ground" viewpoint), there is nothing in Calvinism as a theological system that demands any particular view of end-times.
Unlike some other systems I know :)
It's a hopeful, positive, energetic outlook that bids Christians to be bold and confident.