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Re: [calsify] SKIP was Re: AD review of draft-ietf-calext-rscale-03

Ken Murchison <murch@andrew.cmu.edu> Tue, 03 February 2015 17:58 UTC

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Date: Tue, 03 Feb 2015 12:58:40 -0500
From: Ken Murchison <murch@andrew.cmu.edu>
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To: Cyrus Daboo <cyrus@daboo.name>, Barry Leiba <barryleiba@computer.org>
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Cc: Calsify <calsify@ietf.org>
Subject: Re: [calsify] SKIP was Re: AD review of draft-ietf-calext-rscale-03
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On 02/03/2015 12:51 PM, Cyrus Daboo wrote:
> Hi Ken,
>
> --On February 3, 2015 at 12:38:52 PM -0500 Ken Murchison 
> <murch@andrew.cmu.edu> wrote:
>
>> I believe we can get by with just a single SKIP and your previous rules
>> to handle both cases above (using Hebrew leap month):
>>
>> RRULE:FREQ=YEARLY;RSCALE=HEBREW;SKIP=FORWARD;BYMONTH=5L;BYMONTHDAY=30
>>
>> Would yield 1 Nisan (skipping forward both a month and day)
>>
>>
>> RRULE:FREQ=YEARLY;RSCALE=HEBREW;SKIP=FORWARD;BYMONTH=5L;BYMONTHDAY=-1
>>
>> Would yield 29 Adar (skipping forward just a month)
>>
>
> Actually I am not convinced about that since the spec says that SKIP 
> is applied AFTER all other rule parts are processed (except for 
> BYSETPOS, COUNT and UNTIL). So the BYMONTHDAY=-1 refers to the last 
> day of the invalid month, 30 Adar I, which then becomes the invalid 
> date 30 Adar after the month skip and then 1 Nisan after the day skip.

Hmm, I think you're right based on the current wording.  I don't recall 
exactly how we decided on that wording, but perhaps it might needs to be 
adjusted.

Other than violating the current wording in the spec, does my logic 
appear to be sane?

-- 
Kenneth Murchison
Principal Systems Software Engineer
Carnegie Mellon University

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