week starts at Sunday or Monday??

Peter Ilieve peter at aldie.co.uk
Mon Oct 2 13:21:29 UTC 2000

Christoph Bugel wrote:
> so my question is....
> now that I decided that days are niumbere 1 to 7, 
> what is day 1 ???
> is it Sunday, or Monday?
> what is the Right Thing to do?

The document by Gary Houston describing the ISO 8601:1988 date/time
representations that is available at ftp://elsie.nci.nih.gov/pub/iso8601.ps.gz
contains this paragraph:

  An ordinal date is identified by a given day in a given year.
  A week is identified by its number in a given year. A week
  begins with a Monday, and the first week of a year is the
  one which includes the first Thursday, or equivalently the
  one which includes January 4. Midnight may be expressed as
  either 00:00:00 or 24:00:00.

		Peter Ilieve		peter at aldie.co.uk

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