This is the wrong way to handle $ms !!
It will fail unless there are 6 significant digits!
$err = ( $ms < 100000 ? 'wrong' : '' );
printf "Seconds since epoch (float): %.6f\n", $sec;
# $sec is a float, print it like that...
printf "Seconds since epoch (list): %d.%d $err\n", $s, $ms;
printf "Seconds since epoch (float): %.6f $err\n", $float_t;
Seconds since epocg (float): 1349360875.006262
Seconds since epoch (list): 1349360875.6267 wrong
Seconds since epoch (float): 1349360875.626700 wrong
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