Numbering weeks for the years of this century. An easy problem?

• To: mathgroup at smc.vnet.net
• Subject: [mg89027] Numbering weeks for the years of this century. An easy problem?
• From: Guillermo Sanchez <guillermo.sanchez at hotmail.com>
• Date: Sat, 24 May 2008 03:52:30 -0400 (EDT)

```According to ISO 8601:2004(E), parr. 2.2.10 the  a calendar week
number is defined as ordinal number which identifies a calendar week
within its calendar year according to the rule that the first calendar
week of a year is that one which includes the first Thursday of that
year and that the last calendar week of a calendar year is the week
immediately preceding the first calendar week of the next calendar year.

Could any body build a function for numbering the week for the years
this century?

A think it is not an easy problem (for instance teh solution given by
Excel sometime is wrong
A solution for period 2000-2027 is also wellcome. In this period the
53-week years are 2004, 2009, 2015, 2020, 2026;

Guillermo

```

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