EDIT: in regex'es $d must be $h1 and $e must be $h2 
my %h1 = (
    'Jan' => 'a',
    'Feb' => 'b',
    ...
    'Dec' => 'l',
);

my %h2 = (
    'a' => 'Jan',
    'b' => 'Feb',
    ...
    'l' => 'Dec',
);

my @sorted_dates =
    grep { s/^(.)(\d\d)/$h2{$1} . ' ' . sprintf("%d",$2)/e }
    sort
    grep { s/^(.{3}) (\d\d?)/$h1{$1} . sprintf("%02d",$2)/e; }
    @dates;

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In reply to Re^2: sort based on date by Anonymous Monk
in thread sort based on date by suhailck

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