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2010-12-another-file.html
2010-7-this-is-an.html

2010-07-this-is-an.html
2010-12-another-file.html

$month =~ s/^(\d)$/0$1/; # adds leading zero if there is just a single
                         # digit- otherwise has no effect
...

$month = sprintf("%02d", $month); # re-assigns a new string value 
                                  # to $month no matter what