You should transform the filenames to something that can easily be compared: 

my %month = (
    jan => 1,
    feb => 2,
    ...
);
m/webadmin_([^_]+)_(\d+)_(\d{4})\.log/;
my ($month, $day, $year) = ($1, $2, $3);
my $new_filename = sprintf "%04d-%02d-%02d", $year, $month{$month}, $d
+ay;

[download]

You can combine that with a Schwartzian Transform.

Perl 6 in German

In reply to Re: Sort an array which contains date formatted elements by moritz
in thread Sort an array which contains date formatted elements by msk_0984

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