Re: doing date arithmetic in CL

[Searsdon@xxxxxxx]

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)
 

Don Sears
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reference number: searsdon
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