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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 15:08 UTC

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Date: Tue, 03 Feb 2015 10:08:12 -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 10:02:01 AM -0500 Ken Murchison 
<murch@andrew.cmu.edu> wrote:

> It appears your previous rules properly handle the 30 Adar I (leap year)
> case, but the new rules do not.  Can we come up with rules that can model
> the 3 cases listed above?

OK thanks for looking into that. If we want to provide full flexibility to 
control what happens we would need to have two "skip" indicators, one for 
skipping invalid months and one for skipping invalid days (with the month 
one applied first, followed by the day one). So:

RRULE:FREQ=YEARLY;SKIP-MONTH=FORWARD;SKIP-DAY=FORWARD

Would match the Hebrew birthday case you found.

RRULE:FREQ=YEARLY;SKIP-MONTH=FORWARD;SKIP-DAY=BACKWARD

Would match the behavior from my last email. If we find there really is 
never a use case for the above, then we could stick with the single SKIP 
option. But lets see if we can get a confirmation on that.

-- 
Cyrus Daboo

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