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    Re: AM/PM, [was] Sexagesimal (was Newbie - Variation..)
    From: Yves Arrouye
    Date: 2002 Feb 25, 10:52 -0800

    Ha ha! I found this (and the patch has been applied to the documentation
    Frank Donahoe <> pointed out that the GNU
    tar documentation uses a notation for `noon` that contradicts the
    old traditional notation, and that it`s worth pointing this out in
    the manual to avoid confusion.  Here`s a proposed patch.
    RCS file: doc/tar.texi,v
    retrieving revision 1.12
    retrieving revision
    diff -u -r1.12 -r1.12.0.1
    --- doc/tar.texi        1997/04/24 13:19:40     1.12
    +++ doc/tar.texi        1997/10/27 15:04:02
    @@ -6036,6 +6036,9 @@
     indicates the first half of the day, @samp{pm} indicates the second
     half of the day.  In this notation, 12 is the predecessor of 1:
     midnight is @samp{12am} while noon is @samp{12pm}.
    +(This is the zero-oriented interpretation of @samp{12am} and @samp{12pm},
    +as opposed to the old tradition derived from Latin
    +which uses @samp{12m} for noon and @samp{12pm} for midnight.)
     @cindex timezone correction
     @cindex minutes, timezone correction by
    From bug-gnu-utils-request  Mon Oct 27 11:04:54 1997
    Which suggests that 12pm used to be midnight. It also says that the modern
    use of am/pm is consistent with a zero-based notation where 12 is the
    predecessor of 1. So 12pm precedes 1pm and 12am precedes 1am.
    Now I also found at http://gcv.oecv.at/cgi-bin/info2www?(gcal)Glossary the
    "Civil midnight time"
         In terms of Gcal, this is 0 o'clock, the day change just took part.
         This clocktime is alternatively also denoted as 24 o'clock, or
    Which puts midinight as 12pm. I haven't verified if this is indeed the case
    or a typo in the glossary.

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