🚀 go-pugleaf

Dan.Oscarsson@malmo.trab.se (Dan Oscarsson) writes:
: Looking at POSIX 1003.2 drafts I saw that the date command
: has a output format for week numbers:
:    %U    range (00-53)
:    %W    range (00-53)
: 
: I do not know what POSIX 1003.1 says about strftime for the same
: format codes, but I really hope this is not what the standard contains.
: 
: I doubt there are very many countries that start numbering their weeks
: with 00. Most would start with 01.
: And if it started with 00 it should end with 52.
: 
: Does anybody know how it is?
: If it starts with zero I would expect week number to be worthless
: in many countries.
: 
:     Dan

You are looking at an old draft.  IEEE Std 1003.2-1992 has the following:

    %U   Week of the year (Sunday as the first day of the week) as a
         decimal number (00-53).  All days in a new year preceding the
         first Sunday shall be considered to be in week 0.

    %V   Week of the year (Monday as the first day of the week) as a
         decimal number (01-53).  The method for determining the week
         number shall be as specified by ISO 8601 {4}.

    %W   Week of the year (Monday as the first day of the week) as a
         decimal number (00-53).  All days in a new year preceding the
         first Monday shall be considered to be in week 0.

I believe other responses described the ISO 8601 algorithm.  And, 1003.1
has not modified strftime() [yet?].

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