diff --git a/radicale/tests/static/event_timezone_seconds.ics b/radicale/tests/static/event_timezone_seconds.ics
new file mode 100644
index 0000000..12a8439
--- /dev/null
+++ b/radicale/tests/static/event_timezone_seconds.ics
@@ -0,0 +1,31 @@
+BEGIN:VCALENDAR
+VERSION:2.0
+PRODID:-//Apple Inc.//Mac OS X 10.13.4//EN
+CALSCALE:GREGORIAN
+BEGIN:VTIMEZONE
+TZID:Europe/Moscow
+BEGIN:STANDARD
+TZOFFSETFROM:+023017
+DTSTART:20010101T000000
+TZNAME:GMT+3
+TZOFFSETTO:+023017
+END:STANDARD
+END:VTIMEZONE
+BEGIN:VEVENT
+CREATED:20180420T193555Z
+UID:E96B9F38-8F70-4F1D-AAAC-2CD0BAC40551
+DTEND;TZID=Europe/Moscow:20180420T130000
+TRANSP:OPAQUE
+X-APPLE-TRAVEL-ADVISORY-BEHAVIOR:AUTOMATIC
+SUMMARY:ня — 2
+DTSTART;TZID=Europe/Moscow:20180420T120000
+DTSTAMP:20180420T200353Z
+SEQUENCE:0
+BEGIN:VALARM
+X-WR-ALARMUID:06071073-A112-40CA-83AA-C05F54736B36
+UID:06071073-A112-40CA-83AA-C05F54736B36
+TRIGGER;VALUE=DATE-TIME:19760401T005545Z
+ACTION:NONE
+END:VALARM
+END:VEVENT
+END:VCALENDAR
diff --git a/radicale/tests/test_base.py b/radicale/tests/test_base.py
index ab0c26d..7c43cc5 100644
--- a/radicale/tests/test_base.py
+++ b/radicale/tests/test_base.py
@@ -1405,6 +1405,14 @@ class BaseRequestsMixIn:
         assert status == 404
         assert headers.get("test") == "123"
 
+    def test_timezone_seconds(self):
+        """Verify that timezones with minutes and seconds work."""
+        status, _, _ = self.request("MKCALENDAR", "/calendar.ics/")
+        assert status == 201
+        event = get_file_content("event_timezone_seconds.ics")
+        status, _, _ = self.request("PUT", "/calendar.ics/event.ics", event)
+        assert status == 201
+
     def test_missing_uid(self):
         """Verify that missing UIDs are added in a stable manner."""
         status, _, _ = self.request("MKCALENDAR", "/calendar.ics/")