Re: Can I get the Day of the week?

["L. S. Russell" <leslier@xxxxxxxxxx>]

Doesn't the AS/400 System date depend on a known date?  This is true
with Linux, DOS and Winders.

"DeLong, Eric" wrote:
> 
> No. I can't see that that's a problem. Personally, I can't see how one could
> determine the DOW without some sort of known date. These DOW functions are
> both simple and effective. What's the problem?
> 
> Eric DeLong
> 
> -----Original Message-----
> From: Wills, Mike N. (TC) [mailto:MNWills@taylorcorp.com]
> Sent: Wednesday, May 16, 2001 8:30 AM
> To: 'RPG400-L@midrange.com'
> Subject: RE: Can I get the Day of the week?
> 
> 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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