Yes I agree. We may have a preference to set the week day start (fistDayOfWeek ?).


After that we could agree on the fact the first week is the first complete week (otherwise it can be a preference).

Then we need to find the first day index of the first fistDayOfWeek.
(Date year: self year day: 1) weekdayIndex    
-> gives the index according to the preference (for now Sunday -> 1)

Then it���s quite straightforward to get the week number.

Just have to check if the current date is in the last week of the previous year (returns 52 or 53).
I did something but not sure yet (but no preference).

There are been some works on time representation (Chronos if I remember well ? but cannot load in Pharo 5, depends on OSProcess).

An interesting read [1].

Cheers,

C��drik

ps: http://stephane.ducasse.free.fr/Teaching/CoursAnnecy/0506-M1-COO/A%20New%20Object-Oriented%20Model%20of%20the%20Gregorian%20Calendar.pdf 

Interesting to know. But I see this already seems hard coded...

Date nameOfDay: 1 "--> #Sunday"

Timespan subclass: #Date
poolDictionaries: 'ChronologyConstants'

ChronologyConstants class >> initialize
DayNames := #(Sunday Monday Tuesday Wednesday Thursday Friday Saturday).

Also seems to have changed at some point, with the historical
nameOfDay recorded in the Terse Guide [1] circa 2010 shown to be
different. Perhaps this is something we should make a regional
preference. Was there any ongoing works on other regional
preferences?