• Subject: Re: Processing for 53 weeks??
  • From: "Ralph Day" <ralphday@xxxxxxxxx>
  • Date: Wed, 15 Oct 1997 21:40:48 -0700

boothm@ibm.net wrote:
> There really is never a 13th week, its only that some day-of-the week
> always occur 53 times in a year.   Occasionally that 53rd day happens to
> be your normal end-of-week, so it looks like you have 53 weeks but you
> have 52.14 weeks every year (52.28 during leap year).  So, another choice
> is to just kinda slide the first or last week of the year a bit.  Look at
> a calender to see what causes the least ill effect.

Its quite common in the retail business to use a 4-4-5 calendar.  The 1st
and 2nd months of a quarter are 4 weeks and the 3rd month of the quarter is
5 weeks.  This makes for nice this year/last year comparisons, allows
months to always start and end on a week boundary and is generally nice and
tidy.  But every 4-5 years you have to throw in a 53rd week to keep the
4-4-5 calendar roughly in sync with the normal calendar.  So yes, there
really is no 53rd week in the normal calendar, but yes there is a "leap"
53rd week in the 4-4-5 calendar.

Ralph Day
Systems Development Manager
Recreational Equipment, Inc.

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