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Re: Week code and serial numbers

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  • monahan.p@euro.apple.com
    Hello Again Folks, Not a very good start , geting the ISO number wrong. I am of course referring to ISO 8601. Regards, Pat ... code ... 01 ... of ... has ...
    Message 1 of 2 , Aug 15, 2001
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      Hello Again Folks,
      Not a very good start , geting the ISO number wrong. I am of
      course referring to ISO 8601.

      Regards,
      Pat

      --- In ISO8601@y..., monahan.p@e... wrote:
      > Hello Folks,
      >
      > I am trying to get my company to convert to ISO 1806 for the
      > assignment of the week code used in our serial numbers.
      >
      > I need clear rules that state when the year code and week
      code
      > used in a serial number should change at the start of a new
      > year.
      >
      >
      > For the purpose of this discussion , I will use a serial number
      > format that includes the following year and week code fields ;
      >
      > YYWWSSSSS
      >
      > Where ,
      >
      > YY ---> Year code , example year 2001 is ......
      01
      >
      > WW ---> Calendar week numer as per ISO 1806
      >
      > SSSSS --> Counter code , resets to 00001 at the start
      of
      > a new week
      >
      > As I understand it , ISO 1806 defines Monday as the first day of
      > the week. It also defines week code " 01 " as the week that
      has
      > the first Thursday of that year.
      >
      > In the case of a year where January the first is a Sunday , for
      > example 2006 , a serial number assigned to a product built on
      > Sunday 20060101 [ 1-JAN-2006 ] would have the following
      year
      > code and week code data ;
      >
      > Year code -----> 05
      > Week code ---> 52
      >
      > The logic that I use is that the week code only changes at the
      > start of a new week. Sunday is not the start of a new week. The
      > year code is only checked at the start of a new week.
      >
      > A serial number assigned to a product built on Monday
      > 20060102 [ 2-JAN-2006 ] would have the following year code
      > and week code data ;
      >
      > Year code -----> 06
      > Week code ---> 01
      >
      > An example that features a week code 53 is Saturday
      20050101
      > [ 1-JAN-2005 ]. Serial number assigned to a product built on
      > Saturday 20050101 [ 1-JAN-2005 ] and Sunday 20050102 [ 2-
      > JAN-2005 ] would have the following year code and week code
      > data ;
      >
      > Year code ------> 04
      > Week code -----> 53
      >
      > Serial number assigned to a product built on Monday
      20050103
      > [ 3-JAN-2005 ] would have the following year code and week
      > code data ;
      >
      > Year code ------> 05
      > Week code -----> 01
      >
      > Is the above logic correct ? Does ISO 1806 address the use of
      a
      > week code in serial numbers ?
      >
      > Regards,
      > Pat
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