my $time = convert_tim(1068837428812901);
print "Epoch $time\n", scalar gmtime $time, "\n";

# Seem to need a conversion factor of 976,562.5 is 1,000,000,000/1024
sub convert_tim {
    my $factor = 1_000_000_000/1024;
    return $_[0]/$factor;
}
__DATA__
Epoch 1094489527.10441
Mon Sep  6 16:52:07 2004