Refactored find_by_dates to get rid of END_OF_TIME constant.  Closes Issue266.
Refactored find_by_dates to get rid of END_OF_TIME constant.  Closes Issue266.

git-svn-id: 8ae0a6b396effb9e2d04f216330b631e689e8608@1048 54c6411d-1744-0410-a9eb-b99409f43359

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