Re: Quick Question (aka "yearly w / bymonthday or byday. Please Clarify!")

well seems to me that one should interpret his own way the ambiguous
parts of the rfc...
by the way.. is this forum closed?


Mihai BADEA wrote:

>Hello folks,
>
>This is an older message which I think offers a wrong interpretation of
>the recurrence rules BYDAY and BYMONTHDAY in a YEARLY recurrence when
>BYMONTH is missing. I am surprised that the thread had only three
>messages (2 times the quetion and one final answer, and none following
>comments from anyone).
>
>Vinod_Seraphin/CAM/[email protected] wrote:
>  
>
>>>DTSTART:19970501T090000-0400
>>>RRULE:FREQ=YEARLY;BYMONTHDAY=1,20
>>>
>>>be interpreted as
>>>1) Every May on Days 1 and 20 at 9:00:00
>>>or
>>>2) Every Month on Days 1 and 20 at 9:00:00?
>>>
>>>In other words should DTSTART's month be considered a BYMONTH value in
>>>      
>>>
>>this
>>
>>    
>>
>>>case?
>>>      
>>>
>>It would be interpered as #1.  Yes, DTSTART's month would be considered a
>>BYMONTH value in this case.  To get #2, use FREQ=MONTHLY instead of
>>FREQ=YEARLY
>>    
>>
>Why consider DTSTART's month as a default BYMONTH? Shouldn't we consider
>that BYMONTH is in this case a contracting rule and should not be set by
>default?
>I think the more logical and useful interpretation is #2, which leaves
>the choice to the user to contract the reccurence to only May if he
>wants, by explicitly setting BYMONTH=5.
>  
>
>>    
>>
>>>Similarly, would the following recurrence rule,
>>>
>>>DTSTART:19970502T090000-0400
>>>RRULE:FREQ=YEARLY;BYDAY=MO,FR
>>>
>>>be interpreted as
>>>1) Every Monday and Friday in May at 9:00:00
>>>or
>>>2) Every Monday and Friday at 9:00:00
>>>      
>>>
>>It would be interpreted as #1.  To get #2, use FREQ=WEEKLY instead of
>>FREQ=YEARLY
>>    
>>
>The RFC states clearly that a BYDAY rule refers to the FREQ interval.
>The only ambiguity regarding BYDAY in a YEARLY recurence was when a
>BYMONTH was specified (eg TimeZones), and was agreed after a long
>discussion that when a BYMONTH rule is present, apply BYDAY to the given
>months. But this is not the case.
>Also, it does make sense to specify a rule of "every monday and friday
>in the year".
>So isn't actually #2 the answer?
>  
>
>>- Vinod
>>
>>
>>
>>    
>>
>If there is yet someone still interested of such things these days..
>please make your opinion of statement.
>
>Best regards,
>Mihai
>
>
>
>
>
>
>  
>


-- 

Mihai BADEA
Software Developer - GeCAD Technologies
mailto: [email protected]
Tel/Fax: +40-21-303 2080
http://www.axigen.com
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