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October 1996, Week 2

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Subject:
Re[2]: Interesting date
From:
Bob Brown <[log in to unmask]>
Reply To:
Bob Brown <[log in to unmask]>
Date:
Wed, 9 Oct 1996 14:06:33 -0400
Content-Type:
text/plain
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text/plain (92 lines) 
Jesus Valdez writes:
>Stan Sieler wrote:
>>
>> Wirt writes:
>> ...
>> > The question is: is that day calculation correct? Although when I
>> ...
>> > However I was very pleased at HPWorld '96 when Vladimir Volokh wanted to
>> > show me the new calendar features in MPEX that Eugene had recently
>> > programmed into MPEX (which, BTW, also fails on December 31, 9999).
>>
>> (Fails after 9999-12-31, I think you meant)
>>
>> > Thus, after a fit of dueling calendars on side-by-side terminals, we
>> > demonstrated to each other that our two calendars agreed perfectly. That
>> > demonstration was quite reassuring. Eugene's date calculations so far
>> > have been the only completely independent verfication that QueryCalc's
>> > calendar is correct -- or at least wrong in the same way MPEX is.
>>
>> >From HP-UX & AIX:
>>
>>    cal 12 9999
>>           December 9999
>>    Sun Mon Tue Wed Thu Fri Sat
>>                 1   2   3   4
>>     5   6   7   8   9  10  11
>>    12  13  14  15  16  17  18
>>    19  20  21  22  23  24  25
>>    26  27  28  29  30  31
>>
>> BTW, even a "standard" routine like cal varies from Unix to Unix:
>>
>>    HP-UX:   cal 1 10000
>>    Bad argument
>>
>>    AIX:     cal 1 10000
>>    0702-001 Specify month as number between 1 and 12
>>            Specify year as number between 1 and 9999.
>>
>> POSIX on MPE/iX, OTOH, appears to be implemented by a Stanford fan:
>>
>>    MPE/iX:  cal 1 10000
>>    cal: not found
>>
>> :)
>>
>> --
>> Stan Sieler                                          [log in to unmask]
>>                                      http://www.allegro.com/sieler.htmlI

>don't see any problem with the year 10000 and MPEX:
>% CALENDAR DECEMBER,10000
>               December 10000
>
>
>               SUN  MON  TUE  WED  THU  FRI  SAT
>
>                                         1    2
>                3    4    5    6    7    8    9
>               10   11   12   13   14   15   16
>               17   18   19   20   21   22   23
>               24   25   26   27   28   29   30
>               31


Actually, MPEX seems to be cool out to 32766, which is a relief    :)

calendar dec,32766

                                December 32766

                       SUN  MON  TUE  WED  THU  FRI  SAT

                                             1    2    3
                         4    5    6    7    8    9   10
                        11   12   13   14   15   16   17
                        18   19   20   21   22   23   24
                        25   26   27   28   29   30   31

32768 causes an error message, which is to be expected:

calendar dec,32768

Error: DATEBUILD passed bad year, month, or day (-32768/12/1).

32767 causes MPEX to go into a (seemingly) endless, CPU munching loop.
Fortunately, VESoft has a little bit of time before they need to fix this.
:)

-Bob
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