It will be very nice if you guys merge your work together. When I ported 
iCal to VisualWorks I noticed that Chronos is already a prerequisite of 
iCal and a duplication is therefore not nice to see and just calls to be 
resolved into a merge :)

Best regards
Janko

Alan Lovejoy wrote:
> <JJ (Jason)>Interesting, I had no idea you were doing this.  And thanks for
> stealing my thunder! :)  After you publish it, someone will have to compare
> the different versions (speed, memory, ease of use, etc).</JJ (Jason)>
> 
> I fully intend to have a look at your code--after I've completed my
> implementation.  However, I don't plan on implementing a parser for
> iCal--the only goal is to be able to specify/represent (and fully and
> correctly implement) the iCal rule model.  Actually, the Chronos recurrence
> rule model goes beyond what can be specified using the iCal rule
> model/notation.  Using an algebra enables support for logical negation and
> disjunction, among other things (consider what Chalten does with its
> TimeLineFilter, for example.)
> 
> I'm also working on full support for business date arithmetic. I intend to
> meet or exceed the capabilities offered by jFin
> (http://jfin.org/date_adjustment) or ObjectLab
> (http://objectlabkit.sourceforge.net/), and to use the data provided by
> FinancialCalendar.com (http://financialcalendar.com/).
> 
> As for "thunder stealing," that goes with the territory when two or more
> projects are in the same functional domain.  My goal is to implement the
> world's best date/time library in any language--and I've been working hard
> at it since October 2004.  I feel I've already achieved parity with anything
> else out there.  Now it's time to go to the next level.
> 
> But, since my main motivation for making Chronos the best date/time library
> in the world is to help promote Smalltalk, I actually welcome any and all
> contributions by others to that goal.  And based on the description, your
> iCal engine certainly seems to be a worthy contribution.
> 
> Working together, we can leave Smalltalk's competition in the dust.  And
> inspire those working on Smalltalk projects in domains other than
> dates/times to do the same.
> 
> Go Smalltalk!
> 
> --Alan

-- 
Janko Mivšek
AIDA/Web
Smalltalk Web Application Server
http://www.aidaweb.si