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

Cyrus Daboo <cyrus@daboo.name> Tue, 03 February 2015 17:51 UTC

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Date: Tue, 03 Feb 2015 12:51:43 -0500
From: Cyrus Daboo <cyrus@daboo.name>
To: Ken Murchison <murch@andrew.cmu.edu>, 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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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.

-- 
Cyrus Daboo

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