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Ha ha! I found this (and the patch has been applied to the documentation
BTW):

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 1.12.0.1
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     1.12.0.1
@@ -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
following:

"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
     12pm.

Which puts midinight as 12pm. I haven't verified if this is indeed the case
or a typo in the glossary.

YA

   

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