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

[Cyrus Daboo <[e-mail]>]

Hi,
(Dealing with Barry's AD review issues #2 and #8 in a separate thread)

OK, so I think you have identified a legitimate issue with SKIP. I would 
like to clarify the skip behavior as described below. I will propose 
concrete changes to the draft once we have agreed on the basic concepts.

When a recurrence generates an invalid date, the following applies when 
SKIP is set to FORWARD or BACKWARD:

1) If the invalid date was generated from a rule starting on a leap day or 
a leap month: the SKIP value for forward/backward is then a day or a month, 
respectively.

2) If the invalid date was generated from a rule starting on a day-of-month 
not valid in the current month: the SKIP value for forward/backward is to 
the nearest valid day.

3) If the invalid date was generated from a rule with a BYMONTHDAY that 
results in a day-of-month not valid in the current month: the SKIP value 
for forward/backward is to the nearest valid day.

Note that the above "rules" for SKIP are independent of the actual RSCALE 
value, which I believe is the correct approach (because otherwise we would 
need some kind of registry or an indicator from ICU as to what the behavior 
should be for each calendar scale).

Can other RRULE experts please review the above and make sure those three 
descriptions are valid?

-- 
Cyrus Daboo