python-dateutil will be updated to version 2.x and there may be changes that affect this package. If dmlite-shell will work with the newer python-dateutil, you can safely close this bug. If dmlite-shell really does require python-dateutil 1.5, please use Requires: python-dateutil15 for Fedora versions of the package until it can be updated.
This package only contains one call to dateutil.parser.parse(), it should be fine with any version of dateutil.