currenttime=$(date +%H%M%S);
     peak_time=$(date -d "$peak_time" '+%H%M%S');

 num1=$(($peak_time-$currenttime))
 echo $num1
  if [ $num1 < 0 ]
  then
  echo "peak time is bigger than current"
  else
  echo "peak time is smaller than now"
   fi

if [ 10 < 0 ]
     then
     echo "`peak time is bigger than current`"
    else
     echo "peak time is smaller than now"
      fi