One other suggestion concerning your escaping of underscores "_":

        $outfolder = "REPORT_output\_$year\_$mon\_$mday\_\_$hour\_$min
+\_$sec";
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The underscore character doesn't need to be escaped like this everywhere in a string. If you were doing so to separate it from the preceding variable (ie. "$year\_$mon" in order to interpolate $year instead of $year_), there's another, more common way to do so which is arguably a little easier to read:

        $outfolder = "REPORT_output_${year}_${mon}_${mday}__${hour}_${
+min}_$sec";
[download]

This syntax is also often used to separate variables from other chars which could be part of the variable name; eg.:

my $msg   = "Hello world";
my $color = 101;                   # Red background
print "\e[${color}m $msg \e[m\n";  # Embed $color in escape sequence
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