[vwnc] How to model time and date as first class entity?
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[vwnc] How to model time and date as first class entity?
 
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Hi everybody,
I've got a problem with the date and time model in some biggish manufacturing planning and stockkeeping system and would like to ask for your help. Time and date IMHO needs to be a first class entity in that system under inspection, but it actually isn't. So, there potentially are thousands of buggy or inconsistent uses of Date, Time, Timestamp and even ByteArray to calculate time and date, and I'm very interested in your experiences with time and date models in VW Smalltalk. Is there some reliable VW solution, already? How do you control the complexity of time input, scheduling, calendar calculations and display transformations? Thanks a lot Thomas -- mailto thomas j schrader at web de _______________________________________________________________________ Jetzt neu! Schützen Sie Ihren PC mit McAfee und WEB.DE. 30 Tage kostenlos testen. http://www.pc-sicherheit.web.de/startseite/?mc=022220 _______________________________________________ vwnc mailing list [hidden email] http://lists.cs.uiuc.edu/mailman/listinfo/vwnc |
Re: [vwnc] How to model time and date as first class entity?
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Thomas
It depends on a lot of factors; - Do you need to operate across time zones? - Is the performance of time calculations a concern? - How long a time spand do you need to be concerned with? - Do you need to print time and date in several different formats? Most of the concerns relate to trading off time calculation performance with what needs to be represented. If you are not careful, time calculations can end up using LargeInteger arithmetic, something that is a big performance hit. Terry =========================================================== Terry Raymond Crafted Smalltalk 80 Lazywood Ln. Tiverton, RI 02878 (401) 624-4517 [hidden email] <http://www.craftedsmalltalk.com> =========================================================== > -----Original Message----- > From: [hidden email] [mailto:[hidden email]] On Behalf Of Thomas Schrader > Sent: Monday, November 03, 2008 9:24 AM > To: [hidden email] > Subject: [vwnc] How to model time and date as first class entity? > > Hi everybody, > > I've got a problem with the date and time model in some biggish manufacturing > planning and stockkeeping system and would like to ask for your help. > > Time and date IMHO needs to be a first class entity in that system under > inspection, but it actually isn't. So, there potentially are thousands of buggy > or inconsistent uses of Date, Time, Timestamp and even ByteArray to calculate > time and date, and I'm very interested in your experiences with time and date > models in VW Smalltalk. > > Is there some reliable VW solution, already? How do you control the complexity > of time input, scheduling, calendar calculations and display transformations? > > Thanks a lot > > Thomas > > -- > > mailto thomas j schrader at web de > > _______________________________________________________________________ > Jetzt neu! Schützen Sie Ihren PC mit McAfee und WEB.DE. 30 Tage > kostenlos testen. http://www.pc-sicherheit.web.de/startseite/?mc=022220 > > > _______________________________________________ > vwnc mailing list > [hidden email] > http://lists.cs.uiuc.edu/mailman/listinfo/vwnc _______________________________________________ vwnc mailing list [hidden email] http://lists.cs.uiuc.edu/mailman/listinfo/vwnc |
Re: [vwnc] How to model time and date as first class entity?
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Hi Thomas,
we wrote a hole new Time model because we had the same issues as you mention for our financial app. The model is open source and it is called Chalten (it is available for Squeak, VW and VisualAge) and you can download it from the Cincom's public repository.
You will see that dates, times, days, days of months, years, month of years, time filters (working days, non working days), calendars, etc. are all first class objects. We wrote a paper about it, if you want a copy let me know. Maximiliano Taborda added support for other calendars such as the Irish and some Arabic ones. Hope this help.
Bye, Hernan.
On Mon, Nov 3, 2008 at 1:16 PM, Terry Raymond <[hidden email]> wrote: Thomas _______________________________________________ vwnc mailing list [hidden email] http://lists.cs.uiuc.edu/mailman/listinfo/vwnc |
Re: [vwnc] How to model time and date as first class entity?
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In reply to this post by Thomas Schrader
Hi Thomas:
Have you looked at the Chronos package? On Nov 3, 2008, at 6:23 AM, Thomas Schrader wrote: > Hi everybody, > > I've got a problem with the date and time model in some biggish > manufacturing > planning and stockkeeping system and would like to ask for your help. > > Time and date IMHO needs to be a first class entity in that system > under > inspection, but it actually isn't. So, there potentially are > thousands of buggy > or inconsistent uses of Date, Time, Timestamp and even ByteArray to > calculate > time and date, and I'm very interested in your experiences with time > and date > models in VW Smalltalk. > > Is there some reliable VW solution, already? How do you control the > complexity > of time input, scheduling, calendar calculations and display > transformations? > > Thanks a lot > > Thomas > > -- > > mailto thomas j schrader at web de > > _______________________________________________________________________ > Jetzt neu! Schützen Sie Ihren PC mit McAfee und WEB.DE. 30 Tage > kostenlos testen. http://www.pc-sicherheit.web.de/startseite/? > mc=022220 > > > _______________________________________________ > vwnc mailing list > [hidden email] > http://lists.cs.uiuc.edu/mailman/listinfo/vwnc Thanks!! Joseph Bacanskas [|] --- I use Smalltalk. My amp goes to eleven. _______________________________________________ vwnc mailing list [hidden email] http://lists.cs.uiuc.edu/mailman/listinfo/vwnc |
Re: [vwnc] How to model time and date as first class entity?
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In reply to this post by Thomas Schrader
Hi Terry, Hernan, Joseph,
> ... Chalten ... > ... Chronos ... that all sounds very well to me. I'll try them out and see what I can learn from them. > It depends on a lot of factors ... > Most of the concerns relate to trading off time calculation performance I'm always careful about that and see how far I can go with the packages. Thanks a lot Thomas Schrader -- mailto thomas j schrader at web de ____________________________________________________________________ Psssst! Schon vom neuen WEB.DE MultiMessenger gehört? Der kann`s mit allen: http://www.produkte.web.de/messenger/?did=3123 _______________________________________________ vwnc mailing list [hidden email] http://lists.cs.uiuc.edu/mailman/listinfo/vwnc |
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