If you want a unique filename, combine the timestamp with the process ID of the fork handling the connection...
Your question asks how to get the exact time, but I would be more worried about a guaranteed unique value.
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P.S. Look at POSIX::strftime.
my $Now = strftime('%Y%m%d', localtime)
is much prettier to use than
($sec, $min, ...) = (localtime())[0..5];
$Now = sprintf('%4d%2d%2d', $sec, $min...);
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