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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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CAL(1)							    BSD General Commands Manual 						    CAL(1)

NAME
cal -- displays a calendar SYNOPSIS
cal [-smjy13] [[month] year] DESCRIPTION
Cal displays a simple calendar. If arguments are not specified, the current month is displayed. The options are as follows: -1 Display single month output. (This is the default.) -3 Display prev/current/next month output. -s Display Sunday as the first day of the week. (This is the default.) -m Display Monday as the first day of the week. -j Display Julian dates (days one-based, numbered from January 1). -y Display a calendar for the current year. A single parameter specifies the year (1 - 9999) to be displayed; note the year must be fully specified: ``cal 89'' will not display a calen- dar for 1989. Two parameters denote the month (1 - 12) and year. If no parameters are specified, the current month's calendar is displayed. A year starts on Jan 1. The Gregorian Reformation is assumed to have occurred in 1752 on the 3rd of September. By this time, most countries had recognized the ref- ormation (although a few did not recognize it until the early 1900's.) Ten days following that date were eliminated by the reformation, so the calendar for that month is a bit unusual. HISTORY
A cal command appeared in Version 6 AT&T UNIX. OTHER VERSIONS
Several much more elaborate versions of this program exist, with support for colors, holidays, birthdays, reminders and appointments, etc. For example, try the cal from http://home.sprynet.com/~cbagwell/projects.html or GNU gcal. BSD
June 6, 1993 BSD
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