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Top Forums Shell Programming and Scripting Date One Week Ago From Given Date, Not From Current Date Post 302470292 by Lakris on Tuesday 9th of November 2010 04:50:00 PM
Old 11-09-2010
Hi,
another way is to use the fantastic date command, if perl isn't a requirement, and sh is ok.
Example:
Code:
date +%Y-%m-%d -d "2008-01-03 -7 days"

or in Your case,
Code:
back_time=$(date +%Y-%m-%d -d "2010-07-23 -7 days")

or with variable start date
Code:
start_date=2010-07-23
back_time=$(date +%Y-%m-%d -d "$start_date -7 days")

lots of options and very pedagogic!
Smilie

Best regards,
Lakris

Last edited by Lakris; 11-09-2010 at 05:52 PM.. Reason: added example
 

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Email::Date::Format(3pm)				User Contributed Perl Documentation				  Email::Date::Format(3pm)

NAME
Email::Date::Format - produce RFC 2822 date strings SYNOPSIS
use Email::Date::Format qw(email_date); my $header = email_date($date->epoch); Email::Simple->create( header => [ Date => $header, ], body => '...', ); DESCRIPTION
This module provides a simple means for generating an RFC 2822 compliant datetime string. (In case you care, they're not RFC 822 dates, because they use a four digit year, which is not allowed in RFC 822.) FUNCTIONS email_date my $date = email_date; # now my $date = email_date( time - 60*60 ); # one hour ago "email_date" accepts an epoch value, such as the one returned by "time". It returns a string representing the date and time of the input, as specified in RFC 2822. If no input value is provided, the current value of "time" is used. "format_date" is exported only if requested. email_gmdate my $date = email_gmdate; "email_gmdate" is identical to "email_date", but it will return a string indicating the time in Greenwich Mean Time, rather than local time. "format_gmdate" is exported only if requested. PERL EMAIL PROJECT
This module is maintained by the Perl Email Project <http://emailproject.perl.org/wiki/Email::Date::Format> AUTHOR
Ricardo SIGNES, <rjbs@cpan.org>. Adapted from Email::Date, by Casey West. COPYRIGHT
Copyright (c) 2007, Ricarod SIGNES. This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.8.8 2007-12-13 Email::Date::Format(3pm)
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