Convert nanoseconds (as in InfluxDB measurements) into human readable date/timestamp

ns2date.pl

#!/usr/bin/perl -w
#
$num_of_args = $#ARGV + 1;
if ($num_of_args != 1) {
  print "Usage: ns2date.pl <epochtime in nanoseconds>\n";
  exit;
}

$ns = $ARGV[0];
print scalar localtime($ns / 1000000000) . "\n";