## difftime by Chris F.A. Johnson
## Created Fri Dec 29 03:09:25 EST 2006
## Copyright 2006 Chris F.A. Johnson
## This script is released under the terms of
## the GNU General Public Licence, Version 2


version=0.2

if [ $# -ne 2 ]
then
  cat <<-EOF

	   difftime - calculate sub-second difference between two times

	   USAGE: difftime MM:SS.Frac MM:SS.Frac

	EOF
  exit
fi

awk  -v begin="$1" -v end="$2" 'BEGIN {
   split ( begin, t1, ":" )
   split ( end, t2, ":" )
   d2 = 60 * t2[1] + t2[2]
   d1 = 60 * t1[1] + t1[2]
   diff = d2 - d1

   minutes = int(diff / 60)
   seconds = int(diff) % 60
   split ( diff, d, "." ) 
   printf "%1d:%02d.%d\n", minutes,  seconds,  d[2]
   exit 
}'