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Always allow for 53 weeks. It happens at least every ?5? years. Think:
Is 365.4 divisible by 7? No, it's 52.2. So (5 years) * (.2 weeks/year) =
1 extra week every 5 years. We used to do 13 four week period years and
every 5 years we had one 5 week period.

And, depending on which function you use, there can be 54 weeks!

WEEK
The WEEK function returns an integer between 1 and 54 that represents the
week of the year. The week starts with Sunday, and January 1 is always in
the first week.
WEEK_ISO
The WEEK_ISO function returns an integer between 1 and 53 that represents
the week of the year. The week starts with Monday. Week 1 is the first
week of the year to contain a Thursday, which is equivalent to the first
week containing January 4. Thus, it is possible to have up to 3 days at
the beginning of the year appear as the last week of the previous year or
to have up to 3 days at the end of a year appear as the first week of the
next year.

Rob Berendt

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