python-dateutil will be updated to version 2.x and there may be changes that affect this package. If python-taskw will work with the newer python-dateutil, you can safely close this bug. If python-taskw really does require python-dateutil 1.5, please use Requires: python-dateutil15 for Fedora versions of the package until it can be updated.
Test suite passes with python-dateutil-2.4 and python3-dateutil-2.4.
The tests are authoritative on this one. It's fine (I develop against dateutil-2.2). Thanks!