this fixes the test Sabre_CalDAV_GetEventsByTimerangeTest::testQueryTimerange()
this fixes the test Sabre_CalDAV_GetEventsByTimerangeTest::testQueryTimerange()

linagora/sabre-vobject,sabre-io/vobject,fruux/sabre-vobject,armin-hackmann/sabre-vobject,DavidPrevot/sabre-vobject