Once the elements to be sorted have been combined into a single string it is just a lexical sort so you can use a simple anonymous routine to reverse the order.
knoppix@Microknoppix:~$ perl -E '
> @dates = qw{
> 10/02/2004
> 02/01/2004
> 01/02/2004
> 01/06/2004
> 01/02/2005
> 01/12/2004
> 08/18/2010
> };
> say for
> map { substr $_, 8 }
> sort { $b cmp $a }
> map { join q{}, ( split m{/} )[ 2, 0, 1 ], $_ }
> @dates;'
08/18/2010
01/02/2005
10/02/2004
02/01/2004
01/12/2004
01/06/2004
01/02/2004
knoppix@Microknoppix:~$
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