Almost all reports have built-in flexibility for ranges of dates, amounts, etc. Here is a standard canned report that allows you to choose among different pre-defined time periods:
But you can go beyond the built-in options but manually modifying the report URL.
If you were to go to the URL (address bar at the top of your browser), you'd see a link like this:
Notice the end of the link: months=12
This corresponds to the selection in the report for '12 Months'
But you can change this to any time-range you wish. If you wanted a report for just the last 60 days, you could simply change the last number in the URL, like this:
Even though '2' isn't a predefined option in the report UI, it's easy to hack the report to get exactly what you need.