fix: expand all events that are active in the defined window

icalevents/icalparser.py

@@ -404,7 +404,12 @@ def parse_events(
 
             if e.recurring:
                 rule = parse_rrule(component)
-                for dt in rule.between(f, t, inc=True):
+                # We can not use rule.between because the event has to fit in between https://github.com/jazzband/icalevents/issues/101
+                for dt in [
+                    dt
+                    for dt in list(rule.between(f - (end - start), t + (end - start)))
+                    if dt >= f and dt <= t
+                ]:
                     # Recompute the start time in the current timezone *on* the
                     # date of *this* occurrence. This handles the case where the
                     # recurrence has crossed over the daylight savings time boundary.

test/test_data/recurring_small_window.ics

@@ -0,0 +1,25 @@
+BEGIN:VCALENDAR
+VERSION:2.0
+BEGIN:VTIMEZONE
+TZID:Europe/Berlin
+BEGIN:STANDARD
+DTSTART:19701025T030000
+RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10
+TZNAME:CET
+TZOFFSETFROM:+0200
+TZOFFSETTO:+0100
+END:STANDARD
+BEGIN:DAYLIGHT
+DTSTART:19700329T020000
+RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=3
+TZNAME:CEST
+TZOFFSETFROM:+0100
+TZOFFSETTO:+0200
+END:DAYLIGHT
+END:VTIMEZONE
+BEGIN:VEVENT
+DTSTART;TZID=Europe/Berlin:20211129T000000
+DTEND;TZID=Europe/Berlin:20211129T080000
+RRULE:FREQ=WEEKLY;UNTIL=20221230T230000Z;BYDAY=MO,TU,WE
+END:VEVENT
+END:VCALENDAR

test/test_icalevents.py

@@ -5,6 +5,7 @@ from time import sleep
 from dateutil.relativedelta import relativedelta
 from dateutil.tz import UTC, gettz
 from re import search
+import textwrap
 import pytz
 
 
@@ -932,3 +933,15 @@ class ICalEventsTests(unittest.TestCase):
             "fourth event on 1. jan - 18. and 25. dec are excluded",
         )
         self.assertEqual(events[4].start, date(2024, 1, 8), "fifth event on 8. jan")
+
+    def test_regression_recurring_events_with_timezones(self):
+        # we need to test if all active events are returned, even if they do not fit fully in the defined window
+        tz = gettz("Europe/Berlin")
+        ical = "test/test_data/recurring_small_window.ics"
+        start = datetime(2022, 1, 11, 0, 0, 1, tzinfo=tz)
+        end = datetime(2022, 1, 11, 8, 0, 1, tzinfo=tz)
+
+        events = icalevents.events(file=ical, start=start, end=end, strict=True)
+
+        self.assertEqual(len(events), 1)
+        self.assertEqual(events[0].end.hour, 8)