bysetpos with multiple byweekday in monthly recurrence giving unexpected results

[VinitaPotter]

When the recurrence rule is set for every month on 3rd Monday and Wednesday, the resulting dates are messed up. Attaching a picture from the demo site.

new RRule({
freq: RRule.MONTHLY,
count: 30,
interval: 1,
byweekday: [RRule.MO, RRule.WE],
bysetpos: [3]
})

String: RRULE:FREQ=MONTHLY;COUNT=30;INTERVAL=1;WKST=MO;BYDAY=MO,WE;BYSETPOS=3

But the resulting text and the result are incorrect

rule.toText(): every month on Monday, Wednesday for 30 times

expected rule.toText(): every month on 3rd Monday and Wednesday.

NOTE: bysetpos DOES work with one byweekday but not multiple days array in the demo site.

[Mattkins]

Can confirm I'm seeing the same issue in my own implementation. Is the preference that we use the .nth method instead of trying to combine setpost and weekday?

[Mattkins]

For anyone else looking here, I worked around this using the .nth method on the weekday constants.

rule.freq = RRule.MONTHLY
rule.byweekday = []
this.formGroup.value.byWeekDay.forEach((weekDay) => {
  this.formGroup.value.bySetPos.forEach((setPos) => {
    rule.byweekday.push(weekDay.nth(setPos))
  })
})

[tanthammar]

@Mattkins where does the .nth() method come from?

[Mattkins]

Hopefully I don't lead you on a wild goose chase, it's been a while and we don't work with this library any more. I believe it's on the weekday constants provided by RRule. For example:

const firstTuesday = RRule.TU.nth(1)

[tanthammar]

Hopefully I don't lead you on a wild goose chase, it's been a while and we don't work with this library any more. I believe it's on the weekday constants provided by RRule. For example:

const firstTuesday = RRule.TU.nth(1)

Yes, I found it. Thank you for replying. May I ask which library you are using instead?

[Mattkins]

@tanthammar, we don't do anything with rrule or any repeating dates any more, sorry.