🚀 go-pugleaf

andrew@alarbus.oz.au (Andrew Reye) writes:

>Is there an international standard for numbering weeks.

>Some 1993 diaries have the week with Mon 4th Jan as week
>1 and otheres have it as week 2.

>Is this different in different countries ???

I don't know if it is different in different countries, but at least
in Denmark the rule is that the week with the first Thursday is week
1. If the 1st of January is Friday through Sunday, this is in week 52
or 53. In 1993 it is week 53, in 1994 it will be week 52.

Some printers of calenders in Denmark made the mistake of printing
large quantities of calenders with Jan. 1st being in week one. They
had to recall these. and sell them with warning labels at much reduced
prices. Such an error may have caused the discrepancy between the
diaries you have seen.

	Torben Mogensen (torbenm@diku.dk)

In article <1992Dec18.105632.2494@odin.diku.dk> torbenm@diku.dk (Torben AEgidius Mogensen) writes:
   >Is there an international standard for numbering weeks.

Yes, there is an ISO standard. I don't recall the number. As far as I
know, week numbers aren't much used in the US, for instance. At least
in the Nordic countries it is very common to refer to week numbers, as
in "How about week 24 for the next meeting?".

It is interesting to note that ANSI C and POSIX strftime(3) uses the
wrong week numbering algorithm, at least according to its manual page
in HP-UX, which says:

           %W        week number of the year (the first Monday as the first
                     day of week 1) as a decimal number [00,53]

while the standard says that the week which contains the first
Thursday is week one. Week one could thus start in the previous year,
as it did this year, 1992. Week 1 began on Monday, 1991-12-30 (this is
the ISO standard (human-readable) date format, btw), and ended on
Sunday, 1992-01-05.
--
Tor Lillqvist,
working, but not speaking, for the Technical Research Centre of Finland,
Laboratory for Information Processing (VTT/TIK).

tml@tik.vtt.fi (Tor Lillqvist) writes:

>In article <1992Dec18.105632.2494@odin.diku.dk> torbenm@diku.dk (Torben AEgidius Mogensen) writes:
>   >Is there an international standard for numbering weeks.

Yes, the standard is ISO 8601.

>It is interesting to note that ANSI C and POSIX strftime(3) uses the
>wrong week numbering algorithm, at least according to its manual page
>in HP-UX, which says:

There will be new formatters in POSIX to comply with ISO 8601.
The old behaviour is reatined with existing formatters.

Keld Simonsen

In Europe (?) the first week of a year is the week that has more than 
3 days in it. Weeks goes from monday to sunday.

If a year starts with a week with less than 4 days, it is week 53 of
the previous year.

-- 

:::::::::::::: John Plate, Roskilde University, Denmark :::::::::::::::
:::::::::::::::::::: Internet: <plate@dat.ruc.dk> :::::::::::::::::::::
:::::::::: Fax: (+45) 31 16 16 07 - Phone: (+45) 31 16 80 80 ::::::::::

In article <1992Dec20.193234.8589@ruc.dk> plate@ruc.dk (John Plate) writes:

>In Europe (?) the first week of a year is the week that has more than 
>3 days in it. Weeks goes from monday to sunday.

That's what the ISO standard says, in fact.  Whether anybody outside
Europe knows or cares is another matter.

>If a year starts with a week with less than 4 days, it is week 53 of
>the previous year.

This is not, however, quite correct: it can also be week 52 of the
previous year.  (Let's think ... it happens when the year begins on
a Sunday, or on a Saturday following a non-leap year, right?)
--
Tapani Tarvainen  (tt@math.jyu.fi, tarvainen@finjyu.bitnet)

plate@ruc.dk (John Plate) writes:

>In Europe (?) the first week of a year is the week that has more than 
>3 days in it. Weeks goes from monday to sunday.

>If a year starts with a week with less than 4 days, it is week 53 of
>the previous year.

or it could be week 52. This will happen in 1994.

	Torben Mogensen (torbenm@diku.dk)