diff --git a/Ical.Net.Tests/Calendars/Recurrence/RecurrenceTestCases.txt b/Ical.Net.Tests/Calendars/Recurrence/RecurrenceTestCases.txt
new file mode 100644
index 000000000..05dafe278
--- /dev/null
+++ b/Ical.Net.Tests/Calendars/Recurrence/RecurrenceTestCases.txt
@@ -0,0 +1,4 @@
+# Monday and Thursday, 3 times.
+RRULE:FREQ=WEEKLY;BYDAY=MO,TH;COUNT=3
+DTSTART:20241024
+INSTANCES:20241024,20241028,20241031
diff --git a/Ical.Net.Tests/Ical.Net.Tests.csproj b/Ical.Net.Tests/Ical.Net.Tests.csproj
index dbb76431b..5d9f1c03d 100644
--- a/Ical.Net.Tests/Ical.Net.Tests.csproj
+++ b/Ical.Net.Tests/Ical.Net.Tests.csproj
@@ -18,7 +18,10 @@
-
+
+
+
+
diff --git a/Ical.Net.Tests/IcsFiles.cs b/Ical.Net.Tests/IcsFiles.cs
index b6610b31c..64ddc45ce 100644
--- a/Ical.Net.Tests/IcsFiles.cs
+++ b/Ical.Net.Tests/IcsFiles.cs
@@ -158,5 +158,10 @@ internal static string ReadStream(string manifestResource)
internal static string YearlyCountByMonth1 => ReadStream("Ical.Net.Tests.Calendars.Recurrence.YearlyCountByMonth1.ics");
internal static string YearlyCountByYearDay1 => ReadStream("Ical.Net.Tests.Calendars.Recurrence.YearlyCountByYearDay1.ics");
internal static string YearlyInterval1 => ReadStream("Ical.Net.Tests.Calendars.Recurrence.YearlyInterval1.ics");
+
+ internal static string RecurrrenceTestCases => ReadStream("Ical.Net.Tests.Calendars.Recurrence.RecurrenceTestCases.txt");
+
+ internal static string LibicalIcalrecurTest => ReadStream("Ical.Net.Tests.contrib.libical.icalrecur_test.out");
+
}
}
diff --git a/Ical.Net.Tests/RecurrenceTests.cs b/Ical.Net.Tests/RecurrenceTests.cs
index ec52cef11..039982187 100644
--- a/Ical.Net.Tests/RecurrenceTests.cs
+++ b/Ical.Net.Tests/RecurrenceTests.cs
@@ -3677,5 +3677,116 @@ public void InclusiveRruleUntil()
var occurrences = firstEvent.GetOccurrences(startSearch, endSearch);
Assert.That(occurrences, Has.Count.EqualTo(5));
}
+
+ public class RecurrenceTestCase
+ {
+ public int LineNumber { get; set; }
+
+ public string RRule { get; set; }
+
+ public CalDateTime DtStart { get; set; }
+
+ public CalDateTime StartAt { get; set; }
+
+ public IReadOnlyList Instances { get; set; }
+
+ public override string ToString()
+ => $"Line {LineNumber}: {DtStart}, {RRule}";
+ }
+
+ private static IEnumerable ParseTestCaseFile(string fileContent)
+ {
+ RecurrenceTestCase current = null;
+
+ var rd = new StringReader(fileContent);
+ var lineNo = 0;
+
+ for (string line = rd.ReadLine(); line != null; line = rd.ReadLine())
+ {
+ lineNo++;
+
+ if (string.IsNullOrEmpty(line))
+ {
+ if (current != null)
+ {
+ yield return current;
+ current = null;
+ }
+ continue;
+ }
+
+ if (line.StartsWith("#"))
+ continue;
+
+ current = current ?? new RecurrenceTestCase();
+
+ var m = Regex.Match(line, @"^(?[A-Z-]+):(?.*)$");
+ if (!m.Success)
+ continue;
+
+ var hdr = m.Groups["h"].Value;
+ var val = m.Groups["v"].Value;
+
+ switch (hdr)
+ {
+ case "RRULE":
+ current.RRule = val;
+ current.LineNumber = lineNo;
+ break;
+
+ case "DTSTART":
+ current.DtStart = new CalDateTime(val) { TzId = "UTC" };
+ break;
+
+ case "START-AT":
+ current.StartAt = new CalDateTime(val) { TzId = "UTC" };
+ break;
+
+ case "INSTANCES":
+ current.Instances = val.Split(',').Select(dt => new CalDateTime(dt) { TzId = "UTC" }).ToList();
+ break;
+ }
+ }
+
+ if (current != null)
+ yield return current;
+ }
+
+ private static IEnumerable TestLibicalTestCasesSource
+ => ParseTestCaseFile(IcsFiles.LibicalIcalrecurTest);
+
+ [TestCaseSource(nameof(TestLibicalTestCasesSource))]
+ public void TestLibicalTestCases(RecurrenceTestCase testCase)
+ => ExecuteRecurrenceTestCase(testCase);
+
+ private static IEnumerable TestFileBasedRecurrenceTestCaseSource
+ => ParseTestCaseFile(IcsFiles.RecurrrenceTestCases);
+
+ [TestCaseSource(nameof(TestFileBasedRecurrenceTestCaseSource))]
+ public void TestFileBasedRecurrenceTestCase(RecurrenceTestCase testCase)
+ => ExecuteRecurrenceTestCase(testCase);
+
+ public void ExecuteRecurrenceTestCase(RecurrenceTestCase testCase)
+ {
+ Calendar cal = new Calendar();
+
+ CalendarEvent evt = cal.Create();
+ evt.Summary = "Event summary";
+
+ // Start at midnight, UTC time
+ evt.Start = testCase.DtStart;
+ evt.RecurrenceRules.Add(new RecurrencePattern(testCase.RRule)
+ {
+ RestrictionType = RecurrenceRestrictionType.NoRestriction,
+ });
+
+ var occurrences = evt.GetOccurrences(testCase.StartAt?.Value ?? DateTime.MinValue, DateTime.MaxValue)
+ .OrderBy(x => x)
+ .ToList();
+
+ var startDates = occurrences.Select(x => x.Period.StartTime).ToList();
+
+ Assert.That(startDates, Is.EqualTo(testCase.Instances));
+ }
}
}
diff --git a/Ical.Net.Tests/contrib/libical/LICENSE.txt b/Ical.Net.Tests/contrib/libical/LICENSE.txt
new file mode 100644
index 000000000..ae5fcf4cc
--- /dev/null
+++ b/Ical.Net.Tests/contrib/libical/LICENSE.txt
@@ -0,0 +1,33 @@
+libical is distributed under two licenses.
+You may choose the terms of either:
+
+ * The Mozilla Public License (MPL) v2.0
+
+ or
+
+ * The GNU Lesser General Public License (LGPL) v2.1
+
+----------------------------------------------------------------------
+
+Software distributed under these licenses is distributed on an "AS
+IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
+implied. See the License for the specific language governing rights
+and limitations under the License.
+Libical is distributed under both the LGPL and the MPL. The MPL
+notice, reproduced below, covers the use of either of the licenses.
+
+----------------------------------------------------------------------
+
+ The Original Code is libical.
+
+ The Initial Developer of the Original Code is Eric Busboom
+
+ All Rights Reserved.
+
+ Contributor(s): See individual source files.
+
+ Copyright: The libical developers
+
+
+The project that contains this LICENSE.txt file (ICal.Net) uses the code under the
+Mozilla Public License (MPL) v2.0.
diff --git a/Ical.Net.Tests/contrib/libical/icalrecur_test.out b/Ical.Net.Tests/contrib/libical/icalrecur_test.out
new file mode 100644
index 000000000..ddc57c848
--- /dev/null
+++ b/Ical.Net.Tests/contrib/libical/icalrecur_test.out
@@ -0,0 +1,372 @@
+
+RRULE:FREQ=YEARLY;UNTIL=20000131T140000Z;BYMONTH=1;BYDAY=SU,MO,TU,WE,TH,FR,SA
+DTSTART:19980101T090000
+INSTANCES:19980101T090000,19980102T090000,19980103T090000,19980104T090000,19980105T090000,19980106T090000,19980107T090000,19980108T090000,19980109T090000,19980110T090000,19980111T090000,19980112T090000,19980113T090000,19980114T090000,19980115T090000,19980116T090000,19980117T090000,19980118T090000,19980119T090000,19980120T090000,19980121T090000,19980122T090000,19980123T090000,19980124T090000,19980125T090000,19980126T090000,19980127T090000,19980128T090000,19980129T090000,19980130T090000,19980131T090000,19990101T090000,19990102T090000,19990103T090000,19990104T090000,19990105T090000,19990106T090000,19990107T090000,19990108T090000,19990109T090000,19990110T090000,19990111T090000,19990112T090000,19990113T090000,19990114T090000,19990115T090000,19990116T090000,19990117T090000,19990118T090000,19990119T090000,19990120T090000,19990121T090000,19990122T090000,19990123T090000,19990124T090000,19990125T090000,19990126T090000,19990127T090000,19990128T090000,19990129T090000,19990130T090000,19990131T090000,20000101T090000,20000102T090000,20000103T090000,20000104T090000,20000105T090000,20000106T090000,20000107T090000,20000108T090000,20000109T090000,20000110T090000,20000111T090000,20000112T090000,20000113T090000,20000114T090000,20000115T090000,20000116T090000,20000117T090000,20000118T090000,20000119T090000,20000120T090000,20000121T090000,20000122T090000,20000123T090000,20000124T090000,20000125T090000,20000126T090000,20000127T090000,20000128T090000,20000129T090000,20000130T090000,20000131T090000
+PREV-INSTANCES:20000131T090000,20000130T090000,20000129T090000,20000128T090000,20000127T090000,20000126T090000,20000125T090000,20000124T090000,20000123T090000,20000122T090000,20000121T090000,20000120T090000,20000119T090000,20000118T090000,20000117T090000,20000116T090000,20000115T090000,20000114T090000,20000113T090000,20000112T090000,20000111T090000,20000110T090000,20000109T090000,20000108T090000,20000107T090000,20000106T090000,20000105T090000,20000104T090000,20000103T090000,20000102T090000,20000101T090000,19990131T090000,19990130T090000,19990129T090000,19990128T090000,19990127T090000,19990126T090000,19990125T090000,19990124T090000,19990123T090000,19990122T090000,19990121T090000,19990120T090000,19990119T090000,19990118T090000,19990117T090000,19990116T090000,19990115T090000,19990114T090000,19990113T090000,19990112T090000,19990111T090000,19990110T090000,19990109T090000,19990108T090000,19990107T090000,19990106T090000,19990105T090000,19990104T090000,19990103T090000,19990102T090000,19990101T090000,19980131T090000,19980130T090000,19980129T090000,19980128T090000,19980127T090000,19980126T090000,19980125T090000,19980124T090000,19980123T090000,19980122T090000,19980121T090000,19980120T090000,19980119T090000,19980118T090000,19980117T090000,19980116T090000,19980115T090000,19980114T090000,19980113T090000,19980112T090000,19980111T090000,19980110T090000,19980109T090000,19980108T090000,19980107T090000,19980106T090000,19980105T090000,19980104T090000,19980103T090000,19980102T090000,19980101T090000
+
+RRULE:FREQ=YEARLY;COUNT=10;BYMONTH=6,7
+DTSTART:19970610T090000
+INSTANCES:19970610T090000,19970710T090000,19980610T090000,19980710T090000,19990610T090000,19990710T090000,20000610T090000,20000710T090000,20010610T090000,20010710T090000
+PREV-INSTANCES:20010610T090000,20000710T090000,20000610T090000,19990710T090000,19990610T090000,19980710T090000,19980610T090000,19970710T090000,19970610T090000
+
+RRULE:FREQ=YEARLY;INTERVAL=2;COUNT=10;BYMONTH=1,2,3
+DTSTART:19970310T090000
+INSTANCES:19970310T090000,19990110T090000,19990210T090000,19990310T090000,20010110T090000,20010210T090000,20010310T090000,20030110T090000,20030210T090000,20030310T090000
+PREV-INSTANCES:20030210T090000,20030110T090000,20010310T090000,20010210T090000,20010110T090000,19990310T090000,19990210T090000,19990110T090000,19970310T090000
+
+RRULE:FREQ=YEARLY;INTERVAL=3;COUNT=10;BYYEARDAY=1,100,200
+DTSTART:19970101T090000
+INSTANCES:19970101T090000,19970410T090000,19970719T090000,20000101T090000,20000409T090000,20000718T090000,20030101T090000,20030410T090000,20030719T090000,20060101T090000
+PREV-INSTANCES:20030719T090000,20030410T090000,20030101T090000,20000718T090000,20000409T090000,20000101T090000,19970719T090000,19970410T090000,19970101T090000
+
+RRULE:FREQ=YEARLY;BYDAY=20MO;COUNT=3
+DTSTART:19970519T090000
+INSTANCES:19970519T090000,19980518T090000,19990517T090000
+PREV-INSTANCES:19980518T090000,19970519T090000
+
+RRULE:FREQ=YEARLY;BYWEEKNO=20;BYDAY=MO;COUNT=3
+DTSTART:19970512T090000
+INSTANCES:19970512T090000,19980511T090000,19990517T090000
+PREV-INSTANCES:19980511T090000,19970512T090000
+
+RRULE:FREQ=YEARLY;BYWEEKNO=20;BYDAY=MO;WKST=SU;COUNT=3
+DTSTART:19970512T090000
+INSTANCES:19970512T090000,19980518T090000,19990517T090000
+PREV-INSTANCES:19980518T090000,19970512T090000
+
+RRULE:FREQ=YEARLY;BYWEEKNO=20;BYDAY=MO;WKST=FR;COUNT=3
+DTSTART:19970512T090000
+INSTANCES:19970519T090000,19980518T090000,19990517T090000
+PREV-INSTANCES:19980518T090000,19970519T090000
+
+RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=TH;COUNT=11
+DTSTART:19970313T090000
+INSTANCES:19970313T090000,19970320T090000,19970327T090000,19980305T090000,19980312T090000,19980319T090000,19980326T090000,19990304T090000,19990311T090000,19990318T090000,19990325T090000
+PREV-INSTANCES:19990318T090000,19990311T090000,19990304T090000,19980326T090000,19980319T090000,19980312T090000,19980305T090000,19970327T090000,19970320T090000,19970313T090000
+
+RRULE:FREQ=YEARLY;BYDAY=TH;BYMONTH=6,7,8;COUNT=39
+DTSTART:19970605T090000
+INSTANCES:19970605T090000,19970612T090000,19970619T090000,19970626T090000,19970703T090000,19970710T090000,19970717T090000,19970724T090000,19970731T090000,19970807T090000,19970814T090000,19970821T090000,19970828T090000,19980604T090000,19980611T090000,19980618T090000,19980625T090000,19980702T090000,19980709T090000,19980716T090000,19980723T090000,19980730T090000,19980806T090000,19980813T090000,19980820T090000,19980827T090000,19990603T090000,19990610T090000,19990617T090000,19990624T090000,19990701T090000,19990708T090000,19990715T090000,19990722T090000,19990729T090000,19990805T090000,19990812T090000,19990819T090000,19990826T090000
+PREV-INSTANCES:19990819T090000,19990812T090000,19990805T090000,19990729T090000,19990722T090000,19990715T090000,19990708T090000,19990701T090000,19990624T090000,19990617T090000,19990610T090000,19990603T090000,19980827T090000,19980820T090000,19980813T090000,19980806T090000,19980730T090000,19980723T090000,19980716T090000,19980709T090000,19980702T090000,19980625T090000,19980618T090000,19980611T090000,19980604T090000,19970828T090000,19970821T090000,19970814T090000,19970807T090000,19970731T090000,19970724T090000,19970717T090000,19970710T090000,19970703T090000,19970626T090000,19970619T090000,19970612T090000,19970605T090000
+
+RRULE:FREQ=YEARLY;INTERVAL=4;BYMONTH=11;BYDAY=TU;BYMONTHDAY=2,3,4,5,6,7,8;COUNT=3
+DTSTART:19961105T090000
+INSTANCES:19961105T090000,20001107T090000,20041102T090000
+PREV-INSTANCES:20001107T090000,19961105T090000
+
+RRULE:FREQ=YEARLY;UNTIL=20100326T000000Z;BYDAY=FR;BYYEARDAY=-275,-276,-277,-278,-279,-280,-281
+DTSTART:20060331T020000
+INSTANCES:20060331T020000,20070330T020000,20080328T020000,20090327T020000
+PREV-INSTANCES:20090327T020000,20080328T020000,20070330T020000,20060331T020000
+
+RRULE:FREQ=YEARLY;UNTIL=20140301T115959Z
+DTSTART:20120229T120000Z
+INSTANCES:20120229T120000Z
+PREV-INSTANCES:20120229T120000Z
+
+RRULE:FREQ=MONTHLY;COUNT=10;BYDAY=1FR
+DTSTART:19970905T090000
+INSTANCES:19970905T090000,19971003T090000,19971107T090000,19971205T090000,19980102T090000,19980206T090000,19980306T090000,19980403T090000,19980501T090000,19980605T090000
+PREV-INSTANCES:19980501T090000,19980403T090000,19980306T090000,19980206T090000,19980102T090000,19971205T090000,19971107T090000,19971003T090000,19970905T090000
+
+RRULE:FREQ=MONTHLY;UNTIL=19971224T000000Z;BYDAY=1FR
+DTSTART:19970905T090000
+INSTANCES:19970905T090000,19971003T090000,19971107T090000,19971205T090000
+PREV-INSTANCES:19971205T090000,19971107T090000,19971003T090000,19970905T090000
+
+RRULE:FREQ=MONTHLY;INTERVAL=2;COUNT=10;BYDAY=1SU,-1SU
+DTSTART:19970907T090000
+INSTANCES:19970907T090000,19970928T090000,19971102T090000,19971130T090000,19980104T090000,19980125T090000,19980301T090000,19980329T090000,19980503T090000,19980531T090000
+PREV-INSTANCES:19980503T090000,19980329T090000,19980301T090000,19980125T090000,19980104T090000,19971130T090000,19971102T090000,19970928T090000,19970907T090000
+
+RRULE:FREQ=MONTHLY;COUNT=6;BYDAY=-2MO
+DTSTART:19970922T090000
+INSTANCES:19970922T090000,19971020T090000,19971117T090000,19971222T090000,19980119T090000,19980216T090000
+PREV-INSTANCES:19980119T090000,19971222T090000,19971117T090000,19971020T090000,19970922T090000
+
+RRULE:FREQ=MONTHLY;BYMONTHDAY=-3;COUNT=6
+DTSTART:19970928T090000
+INSTANCES:19970928T090000,19971029T090000,19971128T090000,19971229T090000,19980129T090000,19980226T090000
+PREV-INSTANCES:19980129T090000,19971229T090000,19971128T090000,19971029T090000,19970928T090000
+
+RRULE:FREQ=MONTHLY;COUNT=10;BYMONTHDAY=2,15
+DTSTART:19970902T090000
+INSTANCES:19970902T090000,19970915T090000,19971002T090000,19971015T090000,19971102T090000,19971115T090000,19971202T090000,19971215T090000,19980102T090000,19980115T090000
+PREV-INSTANCES:19980102T090000,19971215T090000,19971202T090000,19971115T090000,19971102T090000,19971015T090000,19971002T090000,19970915T090000,19970902T090000
+
+RRULE:FREQ=MONTHLY;COUNT=10;BYMONTHDAY=1,-1
+DTSTART:19970930T090000
+INSTANCES:19970930T090000,19971001T090000,19971031T090000,19971101T090000,19971130T090000,19971201T090000,19971231T090000,19980101T090000,19980131T090000,19980201T090000
+PREV-INSTANCES:19980131T090000,19980101T090000,19971231T090000,19971201T090000,19971130T090000,19971101T090000,19971031T090000,19971001T090000,19970930T090000
+
+RRULE:FREQ=MONTHLY;INTERVAL=18;COUNT=10;BYMONTHDAY=10,11,12,13,14,15
+DTSTART:19970910T090000
+INSTANCES:19970910T090000,19970911T090000,19970912T090000,19970913T090000,19970914T090000,19970915T090000,19990310T090000,19990311T090000,19990312T090000,19990313T090000
+PREV-INSTANCES:19990312T090000,19990311T090000,19990310T090000,19970915T090000,19970914T090000,19970913T090000,19970912T090000,19970911T090000,19970910T090000
+
+RRULE:FREQ=MONTHLY;INTERVAL=2;BYDAY=TU;COUNT=18
+DTSTART:19970902T090000
+INSTANCES:19970902T090000,19970909T090000,19970916T090000,19970923T090000,19970930T090000,19971104T090000,19971111T090000,19971118T090000,19971125T090000,19980106T090000,19980113T090000,19980120T090000,19980127T090000,19980303T090000,19980310T090000,19980317T090000,19980324T090000,19980331T090000
+PREV-INSTANCES:19980324T090000,19980317T090000,19980310T090000,19980303T090000,19980127T090000,19980120T090000,19980113T090000,19980106T090000,19971125T090000,19971118T090000,19971111T090000,19971104T090000,19970930T090000,19970923T090000,19970916T090000,19970909T090000,19970902T090000
+
+RRULE:FREQ=MONTHLY;BYDAY=FR;BYMONTHDAY=13;COUNT=5
+DTSTART:19970902T090000
+INSTANCES:19980213T090000,19980313T090000,19981113T090000,19990813T090000,20001013T090000
+PREV-INSTANCES:19990813T090000,19981113T090000,19980313T090000,19980213T090000
+
+RRULE:FREQ=MONTHLY;BYDAY=SA;BYMONTHDAY=7,8,9,10,11,12,13;COUNT=10
+DTSTART:19970913T090000
+INSTANCES:19970913T090000,19971011T090000,19971108T090000,19971213T090000,19980110T090000,19980207T090000,19980307T090000,19980411T090000,19980509T090000,19980613T090000
+PREV-INSTANCES:19980509T090000,19980411T090000,19980307T090000,19980207T090000,19980110T090000,19971213T090000,19971108T090000,19971011T090000,19970913T090000
+
+RRULE:FREQ=MONTHLY;COUNT=3;BYDAY=TU,WE,TH;BYSETPOS=3
+DTSTART:19970904T090000
+INSTANCES:19970904T090000,19971007T090000,19971106T090000
+PREV-INSTANCES:19971007T090000,19970904T090000
+
+RRULE:FREQ=MONTHLY;BYDAY=MO,TU,WE,TH,FR;BYSETPOS=-2;COUNT=7
+DTSTART:19970929T090000
+INSTANCES:19970929T090000,19971030T090000,19971127T090000,19971230T090000,19980129T090000,19980226T090000,19980330T090000
+PREV-INSTANCES:19980226T090000,19980129T090000,19971230T090000,19971127T090000,19971030T090000,19970929T090000
+
+RRULE:FREQ=MONTHLY;BYMONTHDAY=15,30;COUNT=5
+DTSTART:20070115T090000
+INSTANCES:20070115T090000,20070130T090000,20070215T090000,20070315T090000,20070330T090000
+PREV-INSTANCES:20070315T090000,20070215T090000,20070130T090000,20070115T090000
+
+RRULE:FREQ=MONTHLY;COUNT=12
+DTSTART:20070131T090000
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+RRULE:FREQ=WEEKLY;INTERVAL=4;BYDAY=SU;COUNT=4
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+
+# TODO: FIX (see https://github.com/ical-org/ical.net/issues/618)
+# RRULE:FREQ=WEEKLY;INTERVAL=1;COUNT=2;BYDAY=MO;
+# DTSTART:20141006T090000
+# INSTANCES:20141006T090000,20141013T090000
+# PREV-INSTANCES:20141006T090000
+
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+RRULE:FREQ=DAILY;INTERVAL=10;COUNT=5
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+RRULE:FREQ=DAILY;BYHOUR=9,10,11,12,13,14,15,16;BYMINUTE=0,20,40;COUNT=48
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+RRULE:FREQ=HOURLY;INTERVAL=3;UNTIL=19970902T170000Z
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+RRULE:FREQ=MINUTELY;INTERVAL=15;COUNT=6
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+RRULE:FREQ=MINUTELY;INTERVAL=90;COUNT=4
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+RRULE:FREQ=DAILY;BYHOUR=9,10,11,12,13,14,15,16;BYMINUTE=0,20,40;COUNT=48
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+RRULE:FREQ=WEEKLY;COUNT=35;BYDAY=SU,TH
+DTSTART:20111120T100000Z
+INSTANCES:20111120T100000Z,20111124T100000Z,20111127T100000Z,20111201T100000Z,20111204T100000Z,20111208T100000Z,20111211T100000Z,20111215T100000Z,20111218T100000Z,20111222T100000Z,20111225T100000Z,20111229T100000Z,20120101T100000Z,20120105T100000Z,20120108T100000Z,20120112T100000Z,20120115T100000Z,20120119T100000Z,20120122T100000Z,20120126T100000Z,20120129T100000Z,20120202T100000Z,20120205T100000Z,20120209T100000Z,20120212T100000Z,20120216T100000Z,20120219T100000Z,20120223T100000Z,20120226T100000Z,20120301T100000Z,20120304T100000Z,20120308T100000Z,20120311T100000Z,20120315T100000Z,20120318T100000Z
+PREV-INSTANCES:20120315T100000Z,20120311T100000Z,20120308T100000Z,20120304T100000Z,20120301T100000Z,20120226T100000Z,20120223T100000Z,20120219T100000Z,20120216T100000Z,20120212T100000Z,20120209T100000Z,20120205T100000Z,20120202T100000Z,20120129T100000Z,20120126T100000Z,20120122T100000Z,20120119T100000Z,20120115T100000Z,20120112T100000Z,20120108T100000Z,20120105T100000Z,20120101T100000Z,20111229T100000Z,20111225T100000Z,20111222T100000Z,20111218T100000Z,20111215T100000Z,20111211T100000Z,20111208T100000Z,20111204T100000Z,20111201T100000Z,20111127T100000Z,20111124T100000Z,20111120T100000Z
+
+RRULE:FREQ=DAILY;UNTIL=20141206T000000Z;BYMONTH=11,12,1,2,3,4,10
+DTSTART:20141030T000000Z
+INSTANCES:20141030T000000Z,20141031T000000Z,20141101T000000Z,20141102T000000Z,20141103T000000Z,20141104T000000Z,20141105T000000Z,20141106T000000Z,20141107T000000Z,20141108T000000Z,20141109T000000Z,20141110T000000Z,20141111T000000Z,20141112T000000Z,20141113T000000Z,20141114T000000Z,20141115T000000Z,20141116T000000Z,20141117T000000Z,20141118T000000Z,20141119T000000Z,20141120T000000Z,20141121T000000Z,20141122T000000Z,20141123T000000Z,20141124T000000Z,20141125T000000Z,20141126T000000Z,20141127T000000Z,20141128T000000Z,20141129T000000Z,20141130T000000Z,20141201T000000Z,20141202T000000Z,20141203T000000Z,20141204T000000Z,20141205T000000Z,20141206T000000Z
+PREV-INSTANCES:20141206T000000Z,20141205T000000Z,20141204T000000Z,20141203T000000Z,20141202T000000Z,20141201T000000Z,20141130T000000Z,20141129T000000Z,20141128T000000Z,20141127T000000Z,20141126T000000Z,20141125T000000Z,20141124T000000Z,20141123T000000Z,20141122T000000Z,20141121T000000Z,20141120T000000Z,20141119T000000Z,20141118T000000Z,20141117T000000Z,20141116T000000Z,20141115T000000Z,20141114T000000Z,20141113T000000Z,20141112T000000Z,20141111T000000Z,20141110T000000Z,20141109T000000Z,20141108T000000Z,20141107T000000Z,20141106T000000Z,20141105T000000Z,20141104T000000Z,20141103T000000Z,20141102T000000Z,20141101T000000Z,20141031T000000Z,20141030T000000Z
+
+RRULE:FREQ=YEARLY;BYWEEKNO=1,2;UNTIL=20170101T000000Z
+DTSTART:20130101T000000
+INSTANCES:20130101T000000,20130108T000000,20131231T000000,20140107T000000,20141230T000000,20150106T000000,20160105T000000,20160112T000000
+PREV-INSTANCES:20160112T000000,20160105T000000,20150106T000000,20141230T000000,20140107T000000,20131231T000000,20130108T000000,20130101T000000
+
+RRULE:FREQ=YEARLY;BYYEARDAY=366;UNTIL=20200101T000000
+DTSTART:20121231T120000
+INSTANCES:20121231T120000,20161231T120000
+PREV-INSTANCES:20161231T120000,20121231T120000
+
+RRULE:FREQ=YEARLY;BYDAY=-1FR;BYMONTH=10;UNTIL=20150101T000000Z
+DTSTART:20101029T120000
+INSTANCES:20101029T120000,20111028T120000,20121026T120000,20131025T120000,20141031T120000
+PREV-INSTANCES:20141031T120000,20131025T120000,20121026T120000,20111028T120000,20101029T120000
+
+RRULE:FREQ=YEARLY;BYDAY=1FR;BYMONTH=4;UNTIL=20150101T000000Z
+DTSTART:20100402T120000
+INSTANCES:20100402T120000,20110401T120000,20120406T120000,20130405T120000,20140404T120000
+PREV-INSTANCES:20140404T120000,20130405T120000,20120406T120000,20110401T120000,20100402T120000
+
+RRULE:FREQ=MONTHLY;BYMONTHDAY=31;COUNT=12
+DTSTART:20150131T000000Z
+INSTANCES:20150131T000000Z,20150331T000000Z,20150531T000000Z,20150731T000000Z,20150831T000000Z,20151031T000000Z,20151231T000000Z,20160131T000000Z,20160331T000000Z,20160531T000000Z,20160731T000000Z,20160831T000000Z
+PREV-INSTANCES:20160731T000000Z,20160531T000000Z,20160331T000000Z,20160131T000000Z,20151231T000000Z,20151031T000000Z,20150831T000000Z,20150731T000000Z,20150531T000000Z,20150331T000000Z,20150131T000000Z
+
+RRULE:FREQ=MONTHLY;BYMONTHDAY=-31;COUNT=12
+DTSTART:20150101T000000Z
+INSTANCES:20150101T000000Z,20150301T000000Z,20150501T000000Z,20150701T000000Z,20150801T000000Z,20151001T000000Z,20151201T000000Z,20160101T000000Z,20160301T000000Z,20160501T000000Z,20160701T000000Z,20160801T000000Z
+PREV-INSTANCES:20160701T000000Z,20160501T000000Z,20160301T000000Z,20160101T000000Z,20151201T000000Z,20151001T000000Z,20150801T000000Z,20150701T000000Z,20150501T000000Z,20150301T000000Z,20150101T000000Z
+
+RRULE:FREQ=YEARLY;BYYEARDAY=366;COUNT=3
+DTSTART:20121231T120000
+INSTANCES:20121231T120000,20161231T120000,20201231T120000
+PREV-INSTANCES:20161231T120000,20121231T120000
+
+RRULE:FREQ=YEARLY;BYYEARDAY=-366;COUNT=3
+DTSTART:20120101T120000
+INSTANCES:20120101T120000,20160101T120000,20200101T120000
+PREV-INSTANCES:20160101T120000,20120101T120000
+
+RRULE:FREQ=YEARLY;INTERVAL=2;UNTIL=20211231T140000Z;BYMONTH=2;BYDAY=WE
+DTSTART:20170201T090000
+START-AT:20200101T100000
+INSTANCES:20210203T090000,20210210T090000,20210217T090000,20210224T090000
+PREV-INSTANCES:20190227T090000,20190220T090000,20190213T090000,20190206T090000,20170222T090000,20170215T090000,20170208T090000,20170201T090000
+
+RRULE:FREQ=MONTHLY;UNTIL=20171229T000000Z;BYDAY=1FR
+DTSTART:20170901T090000
+START-AT:20170915T090000
+INSTANCES:20171006T090000,20171103T090000,20171201T090000
+PREV-INSTANCES:20170901T090000
+
+# TODO: FIX (see https://github.com/ical-org/ical.net/issues/618)
+# RRULE:FREQ=WEEKLY;UNTIL=20170127T000000Z;WKST=MO;BYDAY=SU,TU,TH;INTERVAL=2
+# DTSTART:20161229T090000
+# START-AT:20161231T090000
+# INSTANCES:20170101T090000,20170110T090000,20170112T090000,20170115T090000,20170124T090000,20170126T090000
+# PREV-INSTANCES:20161229T090000
+
+# TODO: FIX (see https://github.com/ical-org/ical.net/issues/618)
+# RRULE:FREQ=WEEKLY;UNTIL=20170127T000000Z;WKST=MO;BYDAY=SU,TU,TH;INTERVAL=2
+# DTSTART:20161229T090000
+# START-AT:20170102T090000
+# INSTANCES:20170110T090000,20170112T090000,20170115T090000,20170124T090000,20170126T090000
+# PREV-INSTANCES:20170101T090000,20161229T090000
+
+RRULE:FREQ=DAILY;UNTIL=20170131T140000Z;BYMONTH=1;INTERVAL=3
+DTSTART:20170101T090000
+START-AT:20170103T090000
+INSTANCES:20170104T090000,20170107T090000,20170110T090000,20170113T090000,20170116T090000,20170119T090000,20170122T090000,20170125T090000,20170128T090000,20170131T090000
+PREV-INSTANCES:20170101T090000
+
+RRULE:FREQ=HOURLY;INTERVAL=3;UNTIL=20170903T170000Z
+DTSTART:20170902T090000
+START-AT:20170902T230000
+INSTANCES:20170903T000000,20170903T030000,20170903T060000,20170903T090000,20170903T120000,20170903T150000
+PREV-INSTANCES:20170902T210000,20170902T180000,20170902T150000,20170902T120000,20170902T090000
+
+RRULE:FREQ=MONTHLY;INTERVAL=13;BYMONTH=5;COUNT=3
+DTSTART:20100212T000000
+INSTANCES:20130512T000000,20260512T000000,20390512T000000
+PREV-INSTANCES:20260512T000000,20130512T000000
+
+RRULE:FREQ=WEEKLY;BYDAY=WE,FR;INTERVAL=2;COUNT=4
+DTSTART:20190101T100000
+INSTANCES:20190102T100000,20190104T100000,20190116T100000,20190118T100000
+PREV-INSTANCES:20190116T100000,20190104T100000,20190102T100000
+
+# TODO: FIX (see https://github.com/ical-org/ical.net/issues/618)
+# RRULE:FREQ=YEARLY;BYWEEKNO=1,2,-1,-2;BYDAY=TU;UNTIL=20170101T000000Z
+# DTSTART:20130101T000000
+# INSTANCES:20130101T000000,20130108T000000,20131217T000000,20131224T000000,20131231T000000,20140107T000000,20141216T000000,20141223T000000,20141230T000000,20150106T000000,20151222T000000,20151229T000000,20160105T000000,20160112T000000,20161220T000000,20161227T000000
+# PREV-INSTANCES:20161227T000000,20161220T000000,20160112T000000,20160105T000000,20151229T000000,20151222T000000,20150106T000000,20141230T000000,20141223T000000,20141216T000000,20140107T000000,20131231T000000,20131224T000000,20131217T000000,20130108T000000,20130101T000000
+
+RRULE:FREQ=YEARLY;BYWEEKNO=53;BYDAY=TU,SA;UNTIL=20170101T000000Z
+DTSTART:20130101T000000
+INSTANCES:20151229T000000,20160102T000000
+PREV-INSTANCES:20160102T000000,20151229T000000
+
+RRULE:FREQ=HOURLY;UNTIL=20210303T000000Z
+DTSTART:20210301T142000
+START-AT:20210302T100000
+INSTANCES:20210302T102000,20210302T112000,20210302T122000,20210302T132000,20210302T142000,20210302T152000,20210302T162000,20210302T172000,20210302T182000,20210302T192000,20210302T202000,20210302T212000,20210302T222000,20210302T232000
+PREV-INSTANCES:20210302T092000,20210302T082000,20210302T072000,20210302T062000,20210302T052000,20210302T042000,20210302T032000,20210302T022000,20210302T012000,20210302T002000,20210301T232000,20210301T222000,20210301T212000,20210301T202000,20210301T192000,20210301T182000,20210301T172000,20210301T162000,20210301T152000,20210301T142000
+
+# TODO: FIX (see https://github.com/ical-org/ical.net/issues/618)
+# RRULE:FREQ=YEARLY;BYWEEKNO=6;BYDAY=TU;WKST=TH;UNTIL=20210612T000000Z
+# DTSTART:20180206T080001
+# INSTANCES:20180213T080001,20190212T080001,20200211T080001,20210209T080001
+# PREV-INSTANCES:20210209T080001,20200211T080001,20190212T080001,20180213T080001
+
+RRULE:FREQ=DAILY;BYMINUTE=1,2,3,4;INTERVAL=2;COUNT=3
+DTSTART:20241018
+INSTANCES:20241018,20241020,20241022
+PREV-INSTANCES:20241020,20241018
diff --git a/Ical.Net.Tests/contrib/libical/readme.txt b/Ical.Net.Tests/contrib/libical/readme.txt
new file mode 100644
index 000000000..2544db28a
--- /dev/null
+++ b/Ical.Net.Tests/contrib/libical/readme.txt
@@ -0,0 +1 @@
+Files in this folder have originally been developed as part of [the libical project](https://github.com/libical/libical). The files may have been modified after copying from libical. To identify the modifications made since copying, refer to the Git history of the individual file or compare with the source file in the libical project.
\ No newline at end of file
diff --git a/license.md b/license.md
index b972e2fdc..6ab648cd6 100644
--- a/license.md
+++ b/license.md
@@ -1,4 +1,4 @@
-The MIT License (MIT)
+The MIT License (MIT)
=====================
Copyright © `2016` `Douglas Day`, `Rian Stockbower`
@@ -24,3 +24,12 @@ WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.
+=====================
+
+
+The following directories and their subdirectories contain code
+that was developed by different projects and is therefore available
+under different licenses. The applicable licensing terms are listed
+in the individual directories and subdirectories.
+
+- `/Ical.Net.Tests/contrib`