In addition to what has been said earlier about the separators in your dates, I would suggest that, if the line that you are reading consist of a date and a filename separated by a comma, as suggested by this line of code:
my ($date, $file_name) = split(",");
then the following line:
$date =~ s@\r|\n@@g; # get rid of trailing newlines, however formatted
is probably useless, since the date is not anywhere near the end of line.
For the rest, the best would be that you supply a short data sample.
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