Sort files descending by date

[Scrat]

Hi Everyone

I have a list of xml files in 'n directory:

WAN_DX_ACD_ACD_2007_06_10_00_10_38_042.csv.xml
WAN_DX_ACH_ACH_2007_06_13_00_10_37_051.csv.xml
WAN_DX_ADY_ADY_2007_06_10_00_10_37_060.csv.xml
WAN_DX_ALD_ALD_2007_06_10_00_10_38_073.csv.xml
WAN_DX_ALE_ALE_2007_06_10_00_10_39_106.csv.xml
WAN_DX_BFN_BFP_2007_06_11_00_15_52_400.csv.xml
WAN_DX_BNA_BNA_2007_06_30_00_22_32_641.csv.xml
WAN_DX_BLV_BLV_2007_06_22_00_22_34_667.csv.xml

The above filenames contain the following (taking the first file as an example):
WAN_DX_ACD_ACD - This is the network device name
2007_06_10 - This is the date (yyyy-mm-dd)
00_10_38_042 - This is the time including milliseconds(00:10:38:042 AM)

I need to sort these files descendingly according to date and then time (process the oldest files first, and the newest files last). This is my code, which doesn't work:

#!/usr/bin/perl
use strict;
use warnings;

my $dir = "D:\\scripts\\";
my (@sorted_list, @file_list);

if ( opendir(DIR, "$dir") ) {
    foreach my $file( readdir(DIR) ) {
        next if ( $file =~ /^\./ );
        if ($file =~ /xml$/) {
            foreach ($file) {
                push (@file_list, $_);
            }
        }
    }
    @sorted_list = map {$_->[0]} sort { $b->[1] <=> $a->[1] } map  { [
+$_,(split/\D/)[15..21]] } @file_list;
    foreach (@sorted_list) {
        print "$_\n";
    }
}
closedir (DIR);

When I print @sorted_list, the contents are still not sorted. What am I doing wrong?

Update:Fixed typo.

Update2:Just realised another mistake - I was printing the old unsorted @file_list in my initial 2nd foreach loop, and not the new, sorted @sorted_list.