Add time for bash

time.sh

#!/bin/bash
#
# Add two "H:M:S" times
# (c) 2012 @dlsym 
# 
#

# Time to seconds
function t2s {
  div=3600; ts=0
  for t in $(echo $1 | tr ":" "\n"); do
    ts=$(($ts + $t*$div)); div=$(($div / 60))
  done
  echo $ts
}

# Seconds to time
function s2t {
 H=$((($1/3600)%24)); M=$((($1/60)%60)); S=$(($1%60))
 printf "%02d:%02d:%02d" $H $M $S
}

# Add time
function addt {
 t1=$(t2s $1); t2=$(t2s $2);
 s2t $(($t1+$t2))
}

addt "12:30" "01:00"; echo 
addt "23:30" "01:10"; echo 
addt "10:30" "11:32:10"; echo