I'm all in favor of being reasonably long-winded if it makes it clear what's going on to future maintenance programmers (or me two months later).
my $datestring = "20050725";
my $year = substr($datestring,0,4);
my $month = substr($datestring,4,2);
my $day = substr($datestring,6,2);
print "$month/$day/$year\n";
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