RE: doing date arithmetic in CL

[Buck Calabro <buck.calabro@xxxxxxxxxxxxxxxxx>]

Don,
This code does not work across the 1999-2000 boundary (I tested it.)
CL can do simple math well, but I would offer the opinion that date math is
not simple.

Buck Calabro

> -----Original Message-----
> From: Searsdon@aol.com 
> Sent: Friday, January 07, 2000 3:03 PM
> To:   RPG400-L@midrange.com; rbrightman@amclog.com
> Subject:      Re: doing date arithmetic in CL
> 
> I Think this example should help you:
> the basic idea was to change a date to a julian date, decrement by a week
> and 
> then convert baack to a standard date. I've been doing simple cl math
> scince 
> the 80's this way.
> 
>              DCL        VAR(&DATE) TYPE(*DEC ) LEN(8 0)
>              DCL        VAR(&CDATE) TYPE(*CHAR) LEN(6)
>              DCL        VAR(&CENDATE) TYPE(*CHAR) LEN(8 )
>              DCL        VAR(&JULDATE) TYPE(*CHAR) LEN(5 ) 
> START:      RTVSYSVAL  SYSVAL(QDATE) RTNVAR(&CDATE)
>              CVTDAT     DATE(&CDATE) TOVAR(&JULDATE) FROMFMT(*MDY) +
>                           TOFMT(*JUL) TOSEP(*NONE)
>              CHGVAR     VAR(&DATE) VALUE(&JULDATE)
>              CHGVAR     VAR(&DATE) VALUE(&DATE - 7)
>              CHGVAR     VAR(&JULDATE) VALUE(&DATE)
>              CVTDAT     DATE(&JULDATE) TOVAR(&CENDATE) FROMFMT(*JUL) +
>                           TOFMT(*YYMD) TOSEP(*NONE)
> 
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