US Week Numbers - USian Advice Needed

Keith Rusler xzekecomax at
Wed May 4 23:07:38 BST 2011

A new week starts every Sunday. So yeah, week one starts on the first Sunday
of the year, regardly of wherever January 1st
starts on. Btw, we aren't called USians, but Americans ;).

On 4 May 2011 17:03, John Layt <johnlayt at> wrote:

> Hi,
> I'm implementing support for US week numbers, but there's conflicting
> information on the great interweb tubes as to what the standard is.
> Some sources say the US Standard is Week 1 is from Jan 1 to the first
> Saturday
> of the year (which may be less than 7 days) then each following week starts
> from Sunday.
> Other sources say Week 1 starts on the first Sunday in the year, with the
> days
> preceeding it being labelled either Week 0 or the last week of the previous
> year.
> Finally there's some suggestion the US military uses simple week numbering,
> i.e. week 1 starts on Jan 1 and lasts 7 days, with each week following in
> order.
> All 3 may even be in regular use and so all will require support.
> A lot of this confusion seems to stem from our dear friends in Redmond
> who's
> aversion to standards leaves them equally unable to correctly implement the
> US
> Week as the ISO Week.
> Beatings with the clue-stick gratefully received.
> John.
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