Logfiles overlap, count twice

Say I have two log files that coinside within each other. One file is from 8-1-2011 to 9-15-2011. The other file is from 9-1-2011 to 9-30-2011. When I process the files using WebLog Expert, the days from 9-1-2011 to 9-15-2011 count twice, from each log file.

How do I make it so only 1 entry is counted no matter what? This is troublesome especially if I have to create a report from log files going back years, and I'm not sure which files overlap.

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