Barry is right, the definition of "year" (beit "fiscal", "calendar" or
some variant thereof) is one of several important facets of the
problem  that must be defined before formulating a solution.  For some
companies, January 1st is actually part of the last (52nd or 53rd)
calendar week of the previous year, and the actual calendar week 1
could start on the Monday, such as this year with 1/3/2005.

Some questions to consider: 

* What day is considered the first day of the year?  (Not always
January 1, particularly if talking a fiscal calendar.)

* What day is considered the first day of a given week? Wall calendars
may show Sunday as the first day of the week, but for each unique
company it could be Monday (first working day), Friday (last working
day), Saturday (last working day), or really any other day.

* When in a 53 week year, is the 53rd week really considered a 53rd
week, or should it be an extended period on the 52nd week?  Keep in
mind that it may be possible to have a 53 week year without a leap
year based on the answers to the previous questions and depending on
what weekday the first of the year shows up on.

These are just some considerations I've faced when writing code for
this week number calculation.  Your individual results may vary.

-Kevin
[EMAIL PROTECTED]
http://www.PrecisOnline.com
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