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Top Forums Shell Programming and Scripting Date after 5 days from current date in YYYYMMDD format Post 302458083 by jgt on Wednesday 29th of September 2010 03:17:30 PM
Old 09-29-2010
The following DIBOL program is a re hash of a program published in Computer World Newspaper in the early 1970's. The original was written in Fortran
It converts a date in the format yyyymmdd into the number days that have elapsed since Jan 1 1900.
It also converts a number representing the number of days since Jan 1 1900 to a date.

All arithmetic is integer, so 8/3 = 2

Code:
#cat xdatex.dbl
.SUBROUTINE XDATEX
DATEXREF,    A
RECORD DATEREC
           CLDRDATE, D8
               CLDRYEAR, D4 @CLDRDATE 
               CLDRMTH,  D2 @CLDRDATE +4    
               CLDRDAY , D2 @CLDRDATE +6
           DAYS1901, D10            
           DAYOFWK,  D1
           NAMOFDAY, A9      
           NAMOFMTH, A9      
RECORD 
        CALCYEAR , D10 
        CALCMTH ,D10
        CALCDAY , D10 
        DYYR , D10 
        DYWK , D10
        DYMO , D10 
        TEMPYEAR , D10 
        TEMPDAY , D10 
        LEAPYEAR , D10
        HOLDDATE , D8   
        M, A8
        DAYDATA, 7A9, 'SUNDAY   ','MONDAY   ','TUESDAY  ','WEDNESDAY'
&,'THURSDAY ','FRIDAY   ','SATURDAY '
        MTHDATA, 12A9, 'JANUARY  ','FEBRUARY ','MARCH   ','APRIL   ',
&'MAY     ','JUNE    ','JULY    ','AUGUST  ',
&'SEPTEMBER','OCTOBER  ','NOVEMBER ','DECEMBER '
PROC
SOJ,
DATEREC=DATEXREF
HOLDDATE=CLDRDATE
IF (DAYS1901 .NE. 0) GO TO CENTOCLD
LEAPYEAR=2
CALCYEAR= CLDRYEAR - 1900
CALCMTH= CLDRMTH
CALCDAY= CLDRDAY
TEMPYEAR= CALCYEAR/4
TEMPYEAR= TEMPYEAR * 4
IF (TEMPYEAR .EQ. CALCYEAR)  LEAPYEAR=1
DYYR= (CALCMTH * 275)/9 + CALCDAY - 30
IF (CALCMTH .GT. 2) DYYR= DYYR -LEAPYEAR
DAYS1901= CALCYEAR - 1
DAYS1901= (DAYS1901 * 1461) / 4 + DYYR
CALL    CENTOCLD
IF (CLDRDATE .NE. HOLDDATE)
BEGIN
DAYS1901= 0
CLDRDATE= 0
DAYOFWK = 0
NAMOFDAY=  
NAMOFMTH=
DATEXREF=DATEREC
RETURN
END
RETURN
CENTOCLD,
CALCYEAR=(DAYS1901/1461) 
CALCYEAR=(DAYS1901 - CALCYEAR + 364)/365
DYYR=((CALCYEAR - 1)*1461)/4
DYYR=DAYS1901-DYYR
LEAPYEAR= 2
        TEMPYEAR= CALCYEAR/4
        TEMPYEAR= TEMPYEAR * 4
IF (TEMPYEAR .EQ. CALCYEAR) LEAPYEAR=1
TEMPDAY= DYYR
TEMPYEAR= 61 - LEAPYEAR 
IF (TEMPDAY .GT. TEMPYEAR) TEMPDAY= TEMPDAY + LEAPYEAR
CALCMTH= (TEMPDAY * 9 + 269) / 275
DYMO= ((CALCMTH * 275) / 9) - 30
CALCDAY= TEMPDAY - DYMO
DYMO=CALCDAY
DYWK=DAYS1901 + 1
DYWK=DYWK-((DYWK/7)*7)+1
DAYOFWK=DYWK
CLDRYEAR = CALCYEAR + 1900
CLDRMTH= CALCMTH
CLDRDAY= CALCDAY
NAMOFDAY=  DAYDATA(DYWK)
NAMOFMTH=MTHDATA(CALCMTH)
DATEXREF=DATEREC
RETURN
#

 

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DtSearchValidDateString(library call)									     DtSearchValidDateString(library call)

NAME
DtSearchValidDateString -- Validate and convert a user date string SYNOPSIS
#include <Dt/Search.h> DtSrObjdate DtSearchValidDateString( char *date_string); DESCRIPTION
DtSearchValidDateString validates a DtSearch date string, as might have been entered by a user in a free form text field, and converts it into a valid DtSrObjdate. Since an invalid date string format returns a distinctive DtSrObjdate, this function may also be used as a boolean test for string valid- ity. ARGUMENTS
date_string Specifies the date string to be validated and converted. The format for a valid date string is "[yyyy [mm [dd]]", one, two, or three ASCII numeric tokens separated by one or more nonnu- meric chars (whitespace, slashes, etc). The integer yyyy represents a Gregorian calendar year number in the range 1990 to 5995 inclusive. If yyyy is less than 1900, 1900 is added to it. The integer mm is a Gregorian calendar month number in the range 1 to 12 inclusive. The integer dd is a Gregorian calendar day number in the range 1 to 31 inclusive. If only two tokens are in the string, they are presumed to be yyyy and mm, and dd is presumed to be to 1. If only one token is in the string, it is presumed to be yyyy, and both mm and dd are presumed to be 1. RETURN VALUE
DtSearchValidDateString returns zero (a valid DtSrObjdate) if date_string is NULL or empty. It returns a correctly formatted DtSrObjdate on successful parse and conversion. It returns -1 and a message on the MessageList if date_string is invalid. SEE ALSO
DtSrAPI(3), DtSearchQuery(3), dtsrfzkfiles(4), DtSearch(5) DtSearchValidDateString(library call)
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