Wrong generation with BYSETPOS and MONTHLY

[Skulli]

Following rule

FREQ=MONTHLY;INTERVAL=1;BYSETPOS=1;BYDAY=SU

used with IceCube::Rule.from_ical(...)

Results should look like (monthly, every first sunday of the month)

https://jkbrzt.github.io/rrule/#/rfc/RRULE:FREQ=MONTHLY;INTERVAL=1;BYSETPOS=1;BYDAY=SU

With IceCube i get something like (occurrences)

[2024-09-01 00:00:00 +0200,
2024-09-08 00:00:00 +0200,
2024-09-15 00:00:00 +0200,
2024-09-22 00:00:00 +0200,
2024-09-29 00:00:00 +0200,
2024-10-06 00:00:00 +0200,
2024-10-13 00:00:00 +0200, ...

weekly repetitions.

Here the to_hash from the schedule

{:start_time=>2024-09-01 00:00:00 +0200, :rrules=>[{:validations=>{:day=>[0]}, :rule_type=>"IceCube::MonthlyRule", :interval=>1}], :rtimes=>[], :extimes=>[]}

[Skulli]

Same in combination with YEARLY

FREQ=Yearly;INTERVAL=1;BYSETPOS=1;BYDAY=SU

[Skulli]

Well old one, see

• Improvement: rule equivalent to BYSETPOS? #289
• Support BYSETPOS for MONTHLY AND YEARLY freq #349
• Update to BYSETPOS support #449

[gap777]

We just ran into this as well!