timeutil.sh

#!/bin/bash

# "hh:mm:ss" to seconds
function hms2sec() {
  hh=$(( 10#`echo $1 | cut -c 1-2` ))
  mm=$(( 10#`echo $1 | cut -c 4-5` ))
  ss=$(( 10#`echo $1 | cut -c 7-8` ))
  echo $(( $hh * 3600 + $mm * 60 + $ss ))
}

# "hh:mm:ss.nnn" to milliseconds
function hmsn2msec() {
  hh=$(( 10#`echo $1 | cut -c 1-2` ))
  mm=$(( 10#`echo $1 | cut -c 4-5` ))
  ss=$(( 10#`echo $1 | cut -c 7-8` ))
  nnn=$(( 10#`echo $1 | cut -c 10-12` ))
  echo $(( ($hh * 3600 + $mm * 60 + $ss) * 1000 + $nnn ))
}