Google Calendar CalDAV time-range not working - google-calendar-api

Question

I am trying to get all events within a time-range. This is my CalDAV request body:
<?xml version="1.0" encoding="UTF-8"?>
<C:calendar-query xmlns:C="urn:ietf:params:xml:ns:caldav">
<D:prop xmlns:D="DAV:">
<C:calendar-data />
</D:prop>
<C:filter>
<C:comp-filter name="VEVENT">
<C:time-range end="20200920T134847" start="20200919T134847" />
</C:comp-filter>
</C:filter>
</C:calendar-query>
As can be seen, I use the time-range component filter.
Unfortunately, this also returns events outside the time-range:
...
DTSTART;TZID=Europe/Amsterdam:20200522T111028
DTEND;TZID=Europe/Amsterdam:20200522T121028
...
Can anyone see what is going wrong?
I saw this and this example which puts the VEVENT comp-filter within a VCALENDAR comp-filter like this:
<?xml version="1.0" encoding="UTF-8"?>
<c:calendar-query xmlns:c="urn:ietf:params:xml:ns:caldav" xmlns:d="DAV:">
<d:prop>
<d:getetag>
<c:calendar-data>
<c:comp name="VCALENDAR">
<c:prop name="VERSION">
<c:comp name="VEVENT">
<c:prop name="SUMMARY">
<c:prop name="UID">
<c:prop name="DTSTART">
<c:prop name="DTEND">
<c:prop name="DURATION">
<c:prop name="RRULE">
<c:prop name="RDATE">
<c:prop name="EXRULE">
<c:prop name="EXDATE">
<c:prop name="RECURRENCE-ID" />
</c:prop>
</c:prop>
</c:prop>
</c:prop>
</c:prop>
</c:prop>
</c:prop>
</c:prop>
</c:prop>
</c:comp>
<c:comp name="VTIMEZONE" />
</c:prop>
</c:comp>
</c:calendar-data>
</d:getetag>
</d:prop>
<c:filter>
<c:comp-filter name="VCALENDAR">
<c:comp-filter name="VEVENT">
<c:time-range start="20060104T000000Z" end="20060105T000000Z" />
</c:comp-filter>
</c:comp-filter>
</c:filter>
</c:calendar-query>
So I tried the following:
<?xml version="1.0" encoding="UTF-8"?>
<C:calendar-query xmlns:C="urn:ietf:params:xml:ns:caldav">
<D:prop xmlns:D="DAV:">
<C:calendar-data />
</D:prop>
<C:filter>
<C:comp-filter name="VCALENDAR">
<C:comp-filter name="VEVENT">
<C:time-range end="20200920T135938" start="20200919T135938" />
</C:comp-filter>
</C:comp-filter>
</C:filter>
</C:calendar-query>
But then Google gives the following error message:
<?xml version="1.0" encoding="UTF-8"?>
<errors xmlns="http://schemas.google.com/g/2005">
<error>
<domain>GData</domain>
<code>badRequest</code>
<internalReason>Bad Request</internalReason>
</error>
</errors>
I can't seem to figure out what is wrong.
//update:
I tried the example from icalendar.org, which seems to work. The only problem is that I can't replicate that request body with caldav4j.
I also tried to copy the exact example from caldav4j:
<?xml version="1.0" encoding="UTF-8"?>
<C:calendar-query xmlns:C="urn:ietf:params:xml:ns:caldav">
<D:prop xmlns:D="DAV:">
<D:getetag />
<C:calendar-data>
<C:comp name="VCALENDAR">
<C:comp name="VEVENT">
<C:prop name="SUMMARY" />
<C:prop name="UID" />
<C:prop name="DTSTART" />
<C:prop name="DTEND" />
<C:prop name="DURATION" />
<C:prop name="RRULE" />
<C:prop name="RDATE" />
<C:prop name="EXRULE" />
<C:prop name="EXDATE" />
<C:prop name="RECURRENCE-ID" />
</C:comp>
<C:comp name="VTIMEZONE" />
<C:prop name="VERSION" />
</C:comp>
</C:calendar-data>
</D:prop>
<C:filter>
<C:comp-filter name="VCALENDAR">
<C:comp-filter name="VEVENT">
<C:time-range end="20200920T161921" start="20200919T161921" />
</C:comp-filter>
</C:comp-filter>
</C:filter>
</C:calendar-query>
Unfortunately it gave another badRequest response.

Answer 1

In the end, I ended up switching to another CalDAV server (Radicale) for server-side logging. It turned out that the time notation should end with a "Z".