You could use a hash that maps the month name to a number and then use a regex to change the date string.
Example:
#!/usr/bin/perl
use strict;
use warnings;
my %mon2num = (
Sept => 9,
Oct => 10,
Nov => 11,
# etc
);
while (<DATA>) {
chomp;
my ($date, $file_name) = split(/,/);
$date =~ s/(\S+)\s(\S+)\s(\S+)/$2 $mon2num{$1} $3/;
print "$date\n";
}
__DATA__
Oct 31 08:30,file1
Nov 25 17:30,file2
Sept 09 12:00,file3
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