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Full Discussion: Date Intervals
Top Forums Shell Programming and Scripting Date Intervals Post 79663 by yongho on Friday 29th of July 2005 12:39:38 PM
Old 07-29-2005
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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DATE(1) 						      General Commands Manual							   DATE(1)

NAME
date - print or set the date and time SYNOPSIS
date [-qsu] [[MMDDYY]hhmm[ss]] [+format] OPTIONS
-q Read the date from stdin -s Set the time (implicit for -q or a date string) -u Print the date as GMT -t Use this number of seconds instead of current time EXAMPLES
date # Print the date and time date 0221921610 # Set date to Feb 21, 1992 at 4:10 p.m. DESCRIPTION
With the -q flag or a numeric argument, date sets the GMT time and date. MMDDYY refers to the month, day, and year; hhmmss refers to the hour, minute and second. Each of the six fields must be exactly two digits, no more and no less. date always display the date and time, with the default format for the system. The -u flag request GMT time instead of local time. A format may be specified with a + followed by a printf-like string with the following options: %% % character %A Name of the day %B Name of the month %D mm/dd/yy %H Decimal hour on 2 digits %I Decimal hour modulo 12 on 2 digits %M Decimal minute on 2 digits %S Decimal seconds on 2 digits %T HH:MM:SS %U Decimal week number, Sunday being first day of week %W Decimal week number, Monday being first day of week %X Same as %T %Y Decimal year on 4 digits %Z Time Zone (if any) %a Abbreviated name of the day %b Abbreviated name of the month %c Appropriate date & time (default format) %d Decimal day of the month on 2 digits %e Same as %d, but a space replaces leading 0 %h Same as %b %j Decimal dey of the year on 3 digits %m Decimal month on 2 digits %n Newline character %p AM or PM %r 12-hour clock time with AM/PM %s Number of seconds since the epoch %t Tab character %w Decimal day of the week (0=Sunday) %x Same as %D %y Decimal year on 2 digits SEE ALSO
time(2), ctime(3), readclock(8). DATE(1)
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