OT: patenting an old year/date concept, to make millions

From: CLASSICCMP_at_trailing-edge.com <(CLASSICCMP_at_trailing-edge.com)>
Date: Mon Nov 15 07:14:53 1999

>I suspect that the check should actually be made for the day field of
>the date word being zero as being invalid... the year can be 00, the
>month can be, too, but the day field should always be non-zero for
>a valid date. (though I've always had a problem with why the months
>field was 0-11 instead of 1-12 when the day field was 1-31).

You might want to check your manuals again, Megan - for the past two
decades that I've been doing RT-11 programming, the month field in the
date word *does* run 1-12, not 0-11. (Actually, 0-11 would make
more sense since you're almost always using it as an index into a
table of month names...)

And, of course, the CSI command lines generally expect RAD50 constants for
months, not numbers, so you can generally type

         037266 instead of JAN
         023112 instead of FEB
         050572 instead of MAR
         004322 instead of APR
         050601 instead of MAY
         040726 instead of JUN
         040724 instead of JUL
         004617 instead of AUG
         073630 instead of SEP
         057114 instead of OCT
         054756 instead of NOV
         014713 instead of DEC

Note that octal 004322 = decimal 2258. So some fixes are going
to happen in the future with date parsing if one wants to be sure not
to confuse 'APR' with the year '2258' :-).

There are some other funny things with year parsing in CSI command lines
that have been around since the mid 70's. In particular, most of the
RT-11 utilities used to (that is, prior to 5.7) take as legal years
59 through 63 decimal. Convert these to octal, and you see they
are represented as 73 through 77. This way, if you forgot the decimal
point on a CSI command line in specifying a year in the range 73-77,
the utility "fixed it up" for you with the "do what I mean" operator :-).
It's a cute trick, but it doesn't work from 1980 through 1999 because
8 and 9 aren't legal octal digits... and it wasn't reimplemented for
4 digit years in the range of 2000-2007.

 Tim Shoppa                        Email: shoppa_at_trailing-edge.com
 Trailing Edge Technology          WWW:   http://www.trailing-edge.com/
 7328 Bradley Blvd		   Voice: 301-767-5917
 Bethesda, MD, USA 20817           Fax:   301-767-5927
Received on Mon Nov 15 1999 - 07:14:53 GMT

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