in reply to Obtaining The Exact Time
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. I think
is much prettier to use thanmy $Now = strftime('%Y%m%d', localtime)
($sec, $min, ...) = (localtime())[0..5]; $Now = sprintf('%4d%2d%2d', $sec, $min...);