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My sincere apologies to Thorvaldur Gunnlaugsson and the list for
replying to the discussion about weekday representation from home,
based on memory and without waiting to refer to the text of the
He is, of course, correct that ISO8601:1998, at least, includes
section 5.2.3 'Date identified by calendar week and day numbers' and
under 22.214.171.124 'Truncated representations' is
g) Day only of the implied week
Basic format: -W-D
> If you want to say monday it is W-1, sunday W-7.
> This looks so bad that it is unuseable.
> I am asking for something like just V1, V7.
> To spell it out clearly, my proposal was V1 V2 V3 V4 V5 V6 V7
> for the week days.
> Another solution would be w1 to w7 if both upper and lowercase is
Now I understand that you're looking for a briefer designator for
"weekday"than the three character sequence -W-.
I see that section g) cited above specifically notes that Monday might
have been represented simply as -1, etc. but this option was
"Although the representation [-W-D] could be abbreviated to [-D]
without risk of misinterpretation, the full, logical, derivation has
been retained because the [W] serves to identify the representation as
a date based on week and day numbers."
I also notice that ISO8601:1988 had a representation for 'Day only of
any week' as [---D] which was omitted in :1998.
My guess is that it would be difficult to persuade the standard
committee to introduce a new designator for this purpose when there is
a workable (if unattractive) construction based on the existing week
Can you tell us anything more about your real-life application where
-W-1 representing "weekday one" does not work? If it's in the midst
of natural language so that it is jarring to the eye, should you just
be using the familiar name of the day?
Also, if ISO8601:2000 specifies something new in this area please let
me know before I embarrass myself even further.