## Week code and serial numbers

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• 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
Message 1 of 2 , Aug 15, 2001
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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
• 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 2 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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