No one really seriously talked about Date::Manip, one of my favorite modules. It sometimes gets a bad rap since it isn't the fastest module, but speed won't be critical for what you are doing.

The following should be adaptable to what you need.

#!perl
use strict;
use warnings;

use Date::Manip;

local $\ = "\n";
Date_Init('TZ=US/Mountain');

my $month = UnixDate('last month', '%B');
my @dates = ParseRecur("every day in $month");

print UnixDate($_, '%D') for @dates;
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