Changes

• Chore: Mark classes and interfaces using EXRULE as obsolete. Reasoning: EXRULE is marked as deprecated in RFC 5545. Neither Google Calendar nor Microsoft Outlook/Exchange support it (https://github.com/ical-org/ical.net/pull/873)
• Feat: CalDateTime.Add(Duration) for empty Durations. The methods gets called frequently during recurrence evaluation. Here it brings a performance improvement of about 10% (https://github.com/ical-org/ical.net/pull/877).
• Fix: FREQ=WEEKLY rules that include BYMONTH were only including weeks that start inside the given months. This fix checks the end of the week also to see if any part of the week is inside the given months (https://github.com/ical-org/ical.net/pull/880)

Details

• Remove misleading FIXME comment in VTimeZoneInfo in https://github.com/ical-org/ical.net/pull/874
• Mark classes and interfaces using EXRULE as obsolete in https://github.com/ical-org/ical.net/pull/873
• Skip CalDateTime.Add(Duration) for Empty Durations in https://github.com/ical-org/ical.net/pull/877
• Update logo image syntax in readme.md in https://github.com/ical-org/ical.net/pull/878
• Fix weekly bymonth by @maknapp in https://github.com/ical-org/ical.net/pull/880
• Bump version 5.1.2 in https://github.com/ical-org/ical.net/pull/881

Big Thanks to New Contributors

• @maknapp made their first contribution in https://github.com/ical-org/ical.net/pull/880

Full Changelog: https://github.com/ical-org/ical.net/compare/v5.1.1...v5.1.2