localtime returns a list. You need indexes 3, 4, and 5 from that list. You're code can be modified like this:

my $lctime = strftime("%m_%d_%y",localtime[3 .. 5]); 
my $fltime = strftime("%m_%d_$y",localtime(stat($filename)[9])[3 .. 5]
+); 
if ($lctime = $fltime) { 
    # processs file data 
}
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