>>Hi Peter,
>>
>>check out: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wceinternational5/html/wce50lrfLCTYPEConstants.asp
>
>Hi Christof,
>
>I understand almost nothing of that page. But I think you're trying to tell me that it's a setting determined by the country chosen in Regional Settings.
>
>I have still not found any place in my OS's where it is displayed explicitly.
>
>I have found another interesting website: http://www.pjh2.de/datetime/weeknumber/wnc.php?l=en
>(I advise people to also skip to higher pages on that site.) It gives a nice view on the diversity and also on which OS has implemented the scheme bad, better or good.
>
>There are two settings important here:
>1) What is the first day of the week.
>2) How is the first week of year determined.
>
>The seconds setting cannot always be determined without first determining the first setting.
>
>My advice is:
>Either offer only the ISO 8601 norm: FDOW is Monday, and FWOY is first week with a Thursday.
>Or offer TWO listboxes. One listbox is used to determine FDOW, and the other listbox determines the FWOY algorithm.

Addendum: The listbox to determine the FDOW needs only THREE items: Saturday, Sunday, Monday. All other days are nowhere in the world a week's start day.