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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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Template::Plugin::Date(3)				User Contributed Perl Documentation				 Template::Plugin::Date(3)

NAME
Template::Plugin::Date - Plugin to generate formatted date strings SYNOPSIS
[% USE date %] # use current time and default format [% date.format %] # specify time as seconds since epoch # or as a 'h:m:s d-m-y' or 'y-m-d h:m:s' string [% date.format(960973980) %] [% date.format('4:20:36 21/12/2000') %] [% date.format('2000/12/21 4:20:36') %] # specify format [% date.format(mytime, '%H:%M:%S') %] # specify locale [% date.format(date.now, '%a %d %b %y', 'en_GB') %] # named parameters [% date.format(mytime, format = '%H:%M:%S') %] [% date.format(locale = 'en_GB') %] [% date.format(time = date.now, format = '%H:%M:%S', locale = 'en_GB) %] # specify default format to plugin [% USE date(format = '%H:%M:%S', locale = 'de_DE') %] [% date.format %] ... DESCRIPTION
The "Date" plugin provides an easy way to generate formatted time and date strings by delegating to the "POSIX" "strftime()" routine. The plugin can be loaded via the familiar USE directive. [% USE date %] This creates a plugin object with the default name of '"date"'. An alternate name can be specified as such: [% USE myname = date %] The plugin provides the "format()" method which accepts a time value, a format string and a locale name. All of these parameters are optional with the current system time, default format ('"%H:%M:%S %d-%b-%Y"') and current locale being used respectively, if undefined. Default values for the time, format and/or locale may be specified as named parameters in the "USE" directive. [% USE date(format = '%a %d-%b-%Y', locale = 'fr_FR') %] When called without any parameters, the "format()" method returns a string representing the current system time, formatted by "strftime()" according to the default format and for the default locale (which may not be the current one, if locale is set in the "USE" directive). [% date.format %] The plugin allows a time/date to be specified as seconds since the epoch, as is returned by "time()". File last modified: [% date.format(filemod_time) %] The time/date can also be specified as a string of the form "h:m:s d/m/y" or "y/m/d h:m:s". Any of the characters : / - or space may be used to delimit fields. [% USE day = date(format => '%A', locale => 'en_GB') %] [% day.format('4:20:00 9-13-2000') %] Output: Tuesday A format string can also be passed to the "format()" method, and a locale specification may follow that. [% date.format(filemod, '%d-%b-%Y') %] [% date.format(filemod, '%d-%b-%Y', 'en_GB') %] A fourth parameter allows you to force output in GMT, in the case of seconds-since-the-epoch input: [% date.format(filemod, '%d-%b-%Y', 'en_GB', 1) %] Note that in this case, if the local time is not GMT, then also specifying '%Z' (time zone) in the format parameter will lead to an extremely misleading result. Any or all of these parameters may be named. Positional parameters should always be in the order "($time, $format, $locale)". [% date.format(format => '%H:%M:%S') %] [% date.format(time => filemod, format => '%H:%M:%S') %] [% date.format(mytime, format => '%H:%M:%S') %] [% date.format(mytime, format => '%H:%M:%S', locale => 'fr_FR') %] [% date.format(mytime, format => '%H:%M:%S', gmt => 1) %] ...etc... The "now()" method returns the current system time in seconds since the epoch. [% date.format(date.now, '%A') %] The "calc()" method can be used to create an interface to the "Date::Calc" module (if installed on your system). [% calc = date.calc %] [% calc.Monday_of_Week(22, 2001).join('/') %] The "manip()" method can be used to create an interface to the "Date::Manip" module (if installed on your system). [% manip = date.manip %] [% manip.UnixDate("Noon Yesterday","%Y %b %d %H:%M") %] AUTHORS
Thierry-Michel Barral wrote the original plugin. Andy Wardley provided some minor fixups/enhancements, a test script and documentation. Mark D. Mills cloned "Date::Manip" from the "Date::Calc" sub-plugin. COPYRIGHT
Copyright (C) 2000-2007 Thierry-Michel Barral, Andy Wardley. This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. SEE ALSO
Template::Plugin, POSIX perl v5.16.3 2012-01-13 Template::Plugin::Date(3)
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