I found a handy technique to find files modified between a specific date. In essence, we touch two temp files, setting the modified dates to the range we want to find:
touch temp -t 201104141130 touch ntemp -t 201104261630
Note the date is yyymmddtime.
Then we run the find command:
find /path/to/folder/ -cnewer temp -and ! -cnewer ntemp