http://www.perlmonks.org?node_id=994117


in reply to Use 'strftime' to calculate a date/time in the Past.

FWIW, I used Time::Local for a one-liner:
perl -MTime::Local=timelocal -e 'print scalar localtime timelocal qw(3 +0 40 2 15 8 2012)';
Update: to get the day, date, and time 48 days ago:
#!/usr/bin/perl -l use strict; use autodie; use warnings; use POSIX 'strftime'; use Time::Local 'timelocal'; my $days_ago = '48'; ($days_ago) = strftime("%d", gmtime( time - $days_ago * 86400 )); print scalar localtime timelocal( 30, 40, 2, $days_ago, 7, 2012, );

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Re^2: Use 'strftime' to calculate a date/time in the Past.
by Anonymous Monk on Sep 17, 2012 at 21:42 UTC
    But you don't do date math, the thing the OP is trying to do