Sure there is a module: 
use Date::Simple qw(date);
my $d = date("2007-12-12");
my $yesterday = $d - 1;
print $yesterday;

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And of course it can be done without a module, because the module is written in Perl as well.

If you want to see how it's done, look at the module's source.

In reply to Re: How to subtract date by 1 day by moritz
in thread How to subtract date by 1 day by ewhitt

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