As a small variant, you can calculate a key by 100*year+month, assuming that month will always be two digit at most...
my @sorted = sort {
($a =~ /\.([0-9]+)-([0-9]+)\./, 100*$1+$2)
<=> ($b =~ /\.([0-9]+)-([0-9]+)\./, 100*$1+$2)
} @strings;
or would it be ok to insert the missing zero?
map { s/-(\d)\./-0\1./ } @strings;
my @sorted = sort @strings;
(Make sure the regexp does not match elsewhere in your strings.)
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