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Full Discussion: Date Substraction
Top Forums UNIX for Dummies Questions & Answers Date Substraction Post 1759 by mib on Thursday 29th of March 2001 03:14:51 AM
Old 03-29-2001
in Perl there is really handy way to manipulate Date
Code:
print scalar localtime (time() - 86400 * n);

it will substract n from current date and print the date

Code:
print scalar localtime (time() - 86400 * 1); #yesterday
print scalar localtime (time() - 86400 * 30); #Date of 30 days back

To get date four days from now
Code:
print scalar localtime (time() + 86400 * 4);

and so on....

Last edited by Yogesh Sawant; 05-20-2010 at 10:53 AM.. Reason: added code tags
 

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Epoch(3)						User Contributed Perl Documentation						  Epoch(3)

NAME
Time::Epoch - Convert between Perl epoch and other epochs SYNOPSIS
#!/usr/bin/perl -wl use Time::Epoch; my $perlsec = 966770660; # Sun Aug 20 07:24:21 2000 -0400 on Mac OS my $epochsec = perl2epoch($perlsec, 'macos', '-0400'); my $perlsec2 = epoch2perl($epochsec, 'macos', '-0400'); print $perlsec; print $perlsec2; print $epochsec; # correct time on Unix: print scalar localtime $perlsec; # correct time on Mac OS (-0400): print scalar localtime $epochsec; DESCRIPTION
Exports two functions, "perl2epoch" and "epoch2perl". Currently only goes between Perl (Unix) epoch and Mac OS epoch. This is in preparation for an eventual move of Perl to its own universal epoch, so we can get the system epoch of any platform that differs from Perl's. Epochs o macos Takes additional optional parameter of time zone differential. If time zone differential not supplied, we guess by getting the different between "localtime" and "gmtime" with <Time::Local::timelocal>. BUGS
o Hm. With the above test, "scalar localtime $perlsec" under my Linux box and "scalar localtime $epochsec" under my Mac OS box are off by one second from each other. Maybe a leap second thing? Odd. AUTHOR
Chris Nandor <pudge@pobox.com>, http://pudge.net/ Copyright (c) 2000-2003 Chris Nandor. All rights reserved. This program is free software; you can redistribute it and/or modify it under the terms of the Artistic License, distributed with Perl. SEE ALSO
perl(1), perlport(1), Time::Local. perl v5.16.2 2003-05-21 Epoch(3)
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