Jim Elwell wrote: >Louis' translation to calendar dates makes a couple of assumptions >as to what is "week 1" and what is "day 1," but they both sound >reasonable to me.
I was always under the impression that 'week 1' is the week that contains the first day of the calendar year i.e. 1st Jan. However I see a different definition in Markus webpage: I quote: [begin quote] "Week 01 of a year is per definition the first week that has the Thursday in this year, which is equivalent to the week that contains the fourth day of January. In other words, the first week of a new year is the week that has the majority of its days in the new year." [end quote] http://www.cl.cam.ac.uk/~mgk25/iso-time.html I have never had to calculate week numbers, they are always readily available (calendars, diaries etc). Even the calendar on my Nokia phone shows week number. If you use Microsoft Outlook, you can see it in the calendar - if it is not set already go to: Tools Options Preferences Calendar Options Then tick 'Show week numbers in the Date Navigator'.
