file_name_201212
 file_name_201301
 file_name_201302
 file_name_201303
 file_name_201304
 file_name_201305
 file_name_201306
 file_name_201307
 file_name_201308
 file_name_201309
 file_name_201310
 file_name_201311

##</code><code>##

#!/usr/bin/perl

use strict;
use warnings;
use POSIX qw/strftime/;

my $this_year = strftime('%Y',localtime);

my $dates = build_file_names();

foreach my $new_file_names (@$dates) {

  print " $new_file_names\n";

  }
  
sub build_file_names {
    
my $last_year = $this_year-1;
my $stop_date = $this_year."12";
my @db_date;

for my $year ($this_year..$this_year) {
    
    for my $month (1..12) {
        my $db_date = sprintf "%d%02d", $year,$month;
        last if ($db_date eq "$stop_date");    
        push @db_date, "file_name_".$db_date;

    }
}

unshift (@db_date, "file_name_".$last_year."12");

 return (\@db_date);

} # End sub build_file_names