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Ordering of week numbers should not matter #513

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Apr 10, 2021
Merged

Ordering of week numbers should not matter #513

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17 changes: 17 additions & 0 deletions net-core/Ical.Net.CoreUnitTests/RecurrenceTests.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -1169,6 +1169,23 @@ public void YearlyByDay1()
);
}

/// <summary>
/// Ordering of byweekno should not matter
/// </summary>
[Test, Category("Recurrence")]
public void WeekNoOrderingShouldNotMatter()
{
var start = new DateTime(2019, 1, 1);
var end = new DateTime(2019, 12, 31);
var rpe1 = new RecurrencePatternEvaluator(new RecurrencePattern("FREQ=YEARLY;WKST=MO;BYDAY=MO;BYWEEKNO=1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31,33,35,37,39,41,43,45,47,49,51,53"));
var rpe2 = new RecurrencePatternEvaluator(new RecurrencePattern("FREQ=YEARLY;WKST=MO;BYDAY=MO;BYWEEKNO=53,51,49,47,45,43,41,39,37,35,33,31,29,27,25,23,21,19,17,15,13,11,9,7,5,3,1"));

var recurringPeriods1 = rpe1.Evaluate(new CalDateTime(start), start, end, false);
var recurringPeriods2 = rpe2.Evaluate(new CalDateTime(start), start, end, false);

Assert.AreEqual(recurringPeriods1.Count, recurringPeriods2.Count);
}

/// <summary>
/// See Page 123 of RFC 2445 - RRULE:FREQ=YEARLY;BYWEEKNO=20;BYDAY=MO
/// </summary>
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2 changes: 1 addition & 1 deletion net-core/Ical.Net/Evaluation/RecurrencePatternEvaluator.cs
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Expand Up @@ -406,9 +406,9 @@ private List<DateTime> GetWeekNoVariants(List<DateTime> dates, RecurrencePattern
var weekNoDates = new List<DateTime>();
foreach (var t in dates)
{
var date = t;
foreach (var weekNo in pattern.ByWeekNo)
{
var date = t;
// Determine our current week number
var currWeekNo = Calendar.GetWeekOfYear(date, CalendarWeekRule.FirstFourDayWeek, pattern.FirstDayOfWeek);
while (currWeekNo > weekNo)
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