RE: Can I get the Day of the week?

Maybe i mis-understand the question...

but, is the DOW not just a day relative to a starting point ???

kmh


At 09:30 AM 5/16/2001, you wrote:
>The one problem I have with most of these suggestions is that the date is
>then dependant upon a known date. Doesn't other people see something wrong
>with this?
>
>Mike
>
>-----Original Message-----
>From: boldt@ca.ibm.com [mailto:boldt@ca.ibm.com]
>Sent: Wednesday, May 16, 2001 7:12 AM
>To: rpg400-l@midrange.com
>Subject: Re: Can I get the Day of the week?
>
>
>From: "Christopher J. Devous" <cdevous@antigua.com>
>Subject: RE: Can I get the Day of the week?
>Christopher wrote:
> >Try this, it's based on the famous "Doomsday" algorithm by JH Conway:
> >
> >    100
>**************************************************************************
> >    200       ***
> >    300       ***      Program Name --  DOWK
> >    400       ***      Description  --  Calculate Day of Week from
>Gregorian
> >    500       ***                       Date
> >    600       ***      Author       --  Christopher J. Devous
>
>As much as I respect John Horton Conway, RPG programmers can't do
>day of week computation much shorter than with this procedure:
>
>  //\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\//
>  // Procedure:  DayOfWeek                                           //
>  // Purpose:  Determine the day of week for a particular date       //
>  // Parameters:                                                     //
>  //    I: dt   -- date                                              //
>  // Returns:                                                        //
>  //    0..6    -- 0=Sunday, 1=Monday, 2=Tuesday, etc.               //
>  // Notes:                                                          //
>  //    January 5, 1800 is a Sunday.  This procedure only works for  //
>  //    dates later than 1800-01-05.                                 //
>  //\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\//
>P DayOfWeek       b
>D DayOfWeek       pi            10i 0
>D   dt                            d   value datfmt(*iso)
>  /free
>     return %rem (%diff (dt: d'1800-01-05': *days): 7);
>  /end-free
>P DayOfWeek       e
>
>
>
>
>
>Hans Boldt, ILE RPG Development, IBM Toronto Lab, boldt@ca.ibm.com
>
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