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Full Discussion: how to get the yesterdays date?
Top Forums Shell Programming and Scripting how to get the yesterdays date? Post 302438138 by pludi on Monday 19th of July 2010 02:43:57 AM
Old 07-19-2010
If only people started to read the docs before complaining that a function doesn't work as they want. Besides that, it's completely useless to call an external program for some functionality that Perl can provide by itself.

First of all, system() does not return the output of a command, but just runs it. What is returned is the exit status of the command, which is the 0 you're seeing. Second, simple date calculation in Perl:
Code:
$ cat date.pl
#!/usr/bin/perl

use strict;
use warnings;
use POSIX qw/strftime/;

my $time1 = time();
my $time2 = time - ( 24 * 60 * 60 );

my $yes1 = strftime '%d-%m-%Y', localtime($time1);
my $yes2 = strftime '%d-%m-%Y', localtime($time2);

print "$yes1\n";
print "$yes2\n";
$ perl date.pl
19-07-2010
18-07-2010

 

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LEARN ABOUT DEBIAN

difftime

DIFFTIME(3)						     Linux Programmer's Manual						       DIFFTIME(3)

NAME

       difftime - calculate time difference

SYNOPSIS

       #include <time.h>

       double difftime(time_t time1, time_t time0);

DESCRIPTION

       The  difftime()	function  returns  the	number of seconds elapsed between time time1 and time time0, represented as a double.  Each of the
       times is specified in calendar time, which means its value is a measurement (in seconds) relative to the Epoch, 1970-01-01  00:00:00  +0000
       (UTC).

CONFORMING TO

       SVr4, 4.3BSD, C89, C99.

NOTES

       On a POSIX system, time_t is an arithmetic type, and one could just define

	      #define difftime(t1,t0) (double)(t1 - t0)

       when the possible overflow in the subtraction is not a concern.	On other systems, the data type time_t might use some other encoding where
       subtraction doesn't work directly.

SEE ALSO

       date(1), gettimeofday(2), time(2), ctime(3), gmtime(3), localtime(3)

COLOPHON

       This page is part of release 3.44 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

GNU
								    2010-02-25							       DIFFTIME(3)
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