Your arguments were completely wrong. Maybe you should reread the documentation for substr. Corrected:
my $newstring = substr($string, 4, 2) # Month (was at 4 len 2)
. substr($string, 6, 2) # Day (was at 6 len 2)
. substr($string, 0, 4); # Year (was at 0 len 4)
which can be simplified to
my $newstring = substr($string, 4, 4) # M+D (was at 4 len 4)
. substr($string, 0, 4); # Year (was at 0 len 4)
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