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datecalendaricalendar
Noor
Noor

Reputation: 20178

ICalender Specification Confusion

I am getting a confusion in the iCalendar specification mainly on page 41, here is an extract of the place where I am getting the problem:

The numeric value in a BYDAY rule part with the FREQ rule part set to YEARLY corresponds to an offset within the month when the BYMONTH rule part is present, and corresponds to an offset within the year when the BYWEEKNO or BYMONTH rule parts are present.

Further in the last line in the same paragraph, it says the following:

the BYDAY rule part MUST NOT be specified with a numeric value with the FREQ rule part set to YEARLY when the BYWEEKNO rule part is specified.

From what I understand, a meaningless rule like FREQ=YEARLY;BYWEEKNO=1,4,5;BYDAY=2MO;COUNT=10 is valid as per the first paragraph but invalid as per the second paragraph.

Is there another interpretation of this ?

Upvotes: 0

Views: 58

Answers (1)

Auberon Vacher
Auberon Vacher

Reputation: 4785

The answer lies in the errata of the RFC5545 whose link is at the top of the RFC which you linked.

The errata 3379 corrects the RFC by saying that RFC5545 Section 3.3.10

[...] should say:

represents the last Monday of the month. The numeric value in a BYDAY rule part with the FREQ rule part set to YEARLY corresponds to an offset within the month when the BYMONTH rule part is present, and corresponds to an offset within the year when the BYMONTH rule part is not present.

(emphasis mine)

Upvotes: 2

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