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Top Forums Shell Programming and Scripting Code creates day 32 instead of 1st day of next month. Post 302441356 by methyl on Friday 30th of July 2010 09:55:16 AM
Old 07-30-2010
The code is clearly a bad adaptation of a clever script to calculate yesterday's date.
It basically it would work for yesterday's date with:
Code:
d=`expr "$d" - 1`
m=`expr "$m" - 1` 
Y=`expr "$Y" - 1`

But it does not work for tomorrow's date with:
Code:
d=`expr "$d" + 1`
m=`expr "$m" + 1` 
Y=`expr "$Y" + 1`

Btw. I get a syntax error with "fmt -1" .
What Operating System and Shell are you using?

There may be better ways to do this depending on what Operating System and Shell you have.

As it stands the script is repairable by changing the logic to suite future dates.
The script contains a method for finding the last day of the month from the output of unix "cal". You'd need to determine whether the day in question is the last day of this month before deciding how to increment day month and year.
 

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Time::CTime(3pm)					User Contributed Perl Documentation					  Time::CTime(3pm)

NAME
Time::CTime -- format times ala POSIX asctime SYNOPSIS
use Time::CTime print ctime(time); print asctime(localtime(time)); print strftime(template, localtime(time)); strftime conversions %% PERCENT %a day of the week abbr %A day of the week %b month abbr %B month %c ctime format: Sat Nov 19 21:05:57 1994 %d DD %D MM/DD/YY %e numeric day of the month %f floating point seconds (milliseconds): .314 %F floating point seconds (microseconds): .314159 %h month abbr %H hour, 24 hour clock, leading 0's) %I hour, 12 hour clock, leading 0's) %j day of the year %k hour %l hour, 12 hour clock %m month number, starting with 1, leading 0's %M minute, leading 0's %n NEWLINE %o ornate day of month -- "1st", "2nd", "25th", etc. %p AM or PM %r time format: 09:05:57 PM %R time format: 21:05 %S seconds, leading 0's %t TAB %T time format: 21:05:57 %U week number, Sunday as first day of week %v DD-Mon-Year %w day of the week, numerically, Sunday == 0 %W week number, Monday as first day of week %x date format: 11/19/94 %X time format: 21:05:57 %y year (2 digits) %Y year (4 digits) %Z timezone in ascii. eg: PST DESCRIPTION
This module provides routines to format dates. They correspond to the libc routines. &strftime() supports a pretty good set of coversions -- more than most C libraries. strftime supports a pretty good set of conversions. The POSIX module has very similar functionality. You should consider using it instead if you do not have allergic reactions to system libraries. GENESIS
Written by David Muir Sharnoff <muir@idiom.org>. The starting point for this package was a posting by Paul Foley <paul@ascent.com> LICENSE
Copyright (C) 1996-2010 David Muir Sharnoff. Copyright (C) 2011 Google, Inc. License hereby granted for anyone to use, modify or redistribute this module at their own risk. Please feed useful changes back to cpan@dave.sharnoff.org. perl v5.12.3 2011-05-12 Time::CTime(3pm)
All times are GMT -4. The time now is 05:17 AM.
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