Date Intervals Post: 79663

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Top Forums Shell Programming and Scripting Date Intervals Post 79663 by yongho on Friday 29th of July 2005 12:39:38 PM

07-29-2005

Registered User

Date Intervals

I posted a question on date intervals about a month back asking about how I could be able to go about a user entering the starting year/month/day and an ending year/month/day and then the script automatically cycling through each day of each month of each year that the user has specified.

I checked out Perderabo's datecalc script and it was helpful but still not exactly what I needed.

I've thrown together some code today but I know that it's not going to work, I just need some suggestions on how I can complete this.

Code:

#!/bin/ksh

#                     Ja Fe Ma Ap My Jn Jl Au Se Oc No De
set -A DaysInMonth xx 31 28 31 30 31 30 31 31 30 31 30 31

isLeapYr=`date.isLeapYr.ksh`
if (( isLeapYr==1 )); then
    DaysInMonth[2]=29
fi

while (( start_date_Y < end_date_Y )); do

    while (( start_date_m < end_date_m )); do

        while (( start_date_d < ${DaysInMonth[${start_date_d}]} )); do
        (( start_date_d=start_date_d+1 ))
        done

        (( start_date_m=start_date_m+1 ))
    done

    (( start_date_Y=start_date_Y+1 ))
done

Some of my concerns are:
Take a look at the start_date_m < end_date_m loop (the 2nd while loop). What if the starting month is 4 and the ending month is 10 (but the user meant the 10 month of the 2nd year) then the loop will break prematurely.

How do I adjust for this?

I'm continuuing to work on this script, so I will keep this post updated.

Last edited by yongho; 07-29-2005 at 01:46 PM..

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LEARN ABOUT REDHAT

cal

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