remove unused
select not only dates, but also times to not to fail on end-of-day borders (e.g. feb 10, 11:30 pm to feb 11, 0:30 pm, see: http://jenkins.plone.org/job/plone-5.0-python-2.7/3063/testReport/junit/plone.app.event.tests.test_robot/RobotTestCase/Scenario_Create_and_view_an_event/ )