The leading 0 indicates the numbers are octal, but 8 and 9 are not legal octal digits, octal digits are 0..7. So put 01 .. 09 in "" or ''.
Also according to your comments, your print statement should be:
print "$months{$outputdates[0]} $outputdates[1], $outputdates[2]\n";
Update:
In my original post, I only mentioned to put 08 and 09 in quotes, as direct answer towards the issue that the OP got illegal octal digit. But CountZero convinced me that, it could be misleading. so I changed it to 01 .. 09, for completeness.
Thanks CountZero for his pursuit of perfection.
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