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axunonb merged 1 commit into from
Dec 13, 2025
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Bump version 5.1.4 #895

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10 changes: 10 additions & 0 deletions release-notes.md
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Expand Up @@ -4,6 +4,16 @@ A listing of what each [Nuget package](https://www.nuget.org/packages/Ical.Net)

## v5

### 5.1.4 - (2025-12-13)

Fix: Regression introduced in v5.1.3 affecting `RRULE:FREQ=YEARLY` when negative `BYMONTHDAY` or `BYYEARDAY` values are used. In certain combinations the evaluator could normalize negative positions incorrectly and skip valid occurrences (e.g., end‑of‑month or end‑of‑year instances). This has been fixed — please upgrade to v5.1.4.

Example of an affected rule (prior behavior could skip results):
```ics
DTSTART:20250101
RRULE:FREQ=YEARLY;BYYEARDAY=-1,1;BYMONTHDAY=-1,1
```

### 5.1.3 - (2025-12-01)

Fix: Correct handling `RRULE:FREQ=YEARLY` combined with `BYMONTH` and `BYWEEKNO`. The previous implementation could skip occurrences in some scenarios.
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