Just to give you a fast review of what I remember (I developed the model that Maxi Taborda converted into Chalten): 1) Chronos supports many calendars, Chalten only the Gregorian Calendar 2) Chronos supports time zones, Chalten does not 3) Choros is huge (as you mentions), Chalten is more manageable (because it just model the Gregorian Calendar) 4) Chronos lacks some abstractions that Chalten has, like Day of Month and others (I don't remember now...there are a couple of mails that I and the guy that created Chronos wrote about these issues, like one year ago) 5) Chalten is based on a arithmetic model that allows you to represent time measurements easily (like 3 days, 5 months, etc). These objects are polymorphic with numbers respect to the arithmetic messages such as +, -, *, etc., that means that you can use them in arithmetic formulas 5) And of course, I like Chalten's model more that Chronos :-). For me it is easier to use, but this is just a matter of taste...
There is a paper we wrote 2 years ago about the problems that the Smalltalk date classes have and the advantages of having a better model. If you are interested on having better date and time classes, I recommend you to read the paper... you may not like it, but at least you will see other people ideas... We use that model (Chalten) in a production system and we believe it allowed us to avoid many common mistakes related to financial systems.... but hey, that's just a feeling, nothing I can prove formally.
I hope you can do something useful. Bye, Hernan.
On 4/16/07, J J azreal1977@hotmail.com wrote:
I have looked at Cronos but it is really huge, and the classes that come with the image are already very close. I will have to look at Chalten, but what is wrong with a few upgrades to the classes that come with Squeak?
From: "Hernan Wilkinson" hernan.wilkinson@gmail.com Reply-To: The general-purpose Squeak developers listsqueak-dev@lists.squeakfoundation.org To: "The general-purpose Squeak developers list"squeak-dev@lists.squeakfoundation.org Subject: Re: Date classes Date: Mon, 16 Apr 2007 14:28:09 -0300
Before doing something with Date, I recommend you to take a look at "Chalten" or "Cronos". Chalten is in SqueakSource.... I think Cronos too.
Hernan.
On 4/16/07, J J azreal1977@hotmail.com wrote:
Hi all,
I am doing some stuff with dates and I noticed the date classes that
come
with the default Squeak image are very nice and very close to having everything I would want. But there are a few inconsistencies here and there, and things missing that would make things easier.
So what is the procedure to updating this? I think it's part of the
core
system so I probably can't just do a monicello package update somewhere? Do I have to do it through mantis?
Thanks, Jason
Download Messenger. Join the i'm Initiative. Help make a difference
today.
Get a FREE Web site, company branded e-mail and more from Microsoft Office Live! http://clk.atdmt.com/MRT/go/mcrssaub0050001411mrt/direct/01/