Easter Recurring Event?

[Dan Hickman]

Can iCalendar represent a recurring event for Easter and the associated events
that are based on Easter (Good Friday, Passover, Mardi Gras, etc)? It doesn't
seem like "1st Sun. after 1st full moon on/after March 21st" can be represented
by a recurrence rule. Is there any plans to handle calculations based on moon
phases.

Thanks,
Dan Hickman
***@rockinsoftware.com

[Chris Uzdavinis]

There are all kinds of strangeness in how we regard time. Governments can
pass laws that change the "time", religions can use weather or solar
events to dictate a "date", and some are impossible to programmatically
cover. (The moon phase would not be impossible... but... attempting to
handle moon phases, in my opinion, would be have a very poor
effort/usefulness ratio.)

Chris

Post by Dan Hickman
Can iCalendar represent a recurring event for Easter and the associated events
that are based on Easter (Good Friday, Passover, Mardi Gras, etc)? It doesn't
seem like "1st Sun. after 1st full moon on/after March 21st" can be represented
by a recurrence rule. Is there any plans to handle calculations based on moon
phases.
Thanks,
Dan Hickman

[Antoine Leca]

Post by Dan Hickman
Can iCalendar represent a recurring event for Easter and the associated events
that are based on Easter (Good Friday, Passover, Mardi Gras, etc)?

I don't think so (in the current draft).

Post by Dan Hickman
It doesn't seem like "1st Sun. after 1st full moon on/after March 21st"
can be represented by a recurrence rule.

Agreed (in the current draft).

Post by Dan Hickman
Is there any plans to handle calculations based on moon phases.

I don't think this is a good idea, because the real need (the date for
Easter)
is much more simple than the solution you are trying to build.
What is really behind your solution is a specification for different
calendars from the Gregorian one. And we clearly decides to NOT ADDRESS
this issue in the current version of iCal.

I think the obvious solution should be to keep in the agents a list of
the
Easter dates in an workable range (well, this is what I would do, and
this is
what I have always seen so far).

So I think another solution can be to add a new form of RRULE to specify
an
event related to Easter, with a new syntax.
However, I see this as outside the current scope of the WG.
Perhaps for a "release 2" of iCal?


Antoine

[Frank Dawson]

The iCalendar current specification is "enabled" for non-Gregorian calendars, such as the lunar calendar. However, your suggestion implies a requirement for mixing of lunar and non-lunar calendar semantics. This has not been promoted in discussions todate.

- - Frank Dawson
-

-----Original Message-----
From: Dan Hickman [SMTP:***@rockinsoftware.com]
Sent: Wednesday, November 26, 1997 10:03 AM
To: 'ietf-***@imc.org'
Subject: Easter Recurring Event?

Can iCalendar represent a recurring event for Easter and the associated events
that are based on Easter (Good Friday, Passover, Mardi Gras, etc)? It doesn't
seem like "1st Sun. after 1st full moon on/after March 21st" can be represented
by a recurrence rule. Is there any plans to handle calculations based on moon
phases.

Thanks,
Dan Hickman
***@rockinsoftware.com