Convert EXDATE and RDATE to same type as DTSTART

Fixes #1146
Closes #1199

radicale/tests/static/event_mixed_datetime_and_date.ics

@@ -0,0 +1,33 @@
+BEGIN:VCALENDAR
+PRODID:-//Mozilla.org/NONSGML Mozilla Calendar V1.1//EN
+VERSION:2.0
+BEGIN:VTIMEZONE
+TZID:Europe/Paris
+X-LIC-LOCATION:Europe/Paris
+BEGIN:DAYLIGHT
+TZOFFSETFROM:+0100
+TZOFFSETTO:+0200
+TZNAME:CEST
+DTSTART:19700329T020000
+RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=3
+END:DAYLIGHT
+BEGIN:STANDARD
+TZOFFSETFROM:+0200
+TZOFFSETTO:+0100
+TZNAME:CET
+DTSTART:19701025T030000
+RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10
+END:STANDARD
+END:VTIMEZONE
+BEGIN:VEVENT
+CREATED:20130902T150157Z
+LAST-MODIFIED:20130902T150158Z
+DTSTAMP:20130902T150158Z
+UID:event_mixed_datetime_and_date
+SUMMARY:Event
+DTSTART;TZID=Europe/Paris:20130901T180000
+DTEND;TZID=Europe/Paris:20130901T190000
+RRULE:FREQ=DAILY;COUNT=3
+EXDATE;VALUE=DATE:20130902
+END:VEVENT
+END:VCALENDAR

radicale/tests/test_base.py

@@ -97,6 +97,12 @@ permissions: RrWw""")
         assert xml.tag == xmlutils.make_clark("D:error")
         assert xml.find(xmlutils.make_clark("C:no-uid-conflict")) is not None
 
+    def test_add_event_with_mixed_datetime_and_date(self) -> None:
+        """Test event with DTSTART as DATE-TIME and EXDATE as DATE."""
+        self.mkcalendar("/calendar.ics/")
+        event = get_file_content("event_mixed_datetime_and_date.ics")
+        self.put("/calendar.ics/event.ics", event)
+
     def test_add_todo(self) -> None:
         """Add a todo."""
         self.mkcalendar("/calendar.ics/")