Calculate time between git commits

git_time_between_commits.sh

# Calculate time between git commits
# Update rev-list target to your range or branch
# ref https://stackoverflow.com/questions/22725469/calculate-time-between-git-commits
for ix in `git rev-list @`; do
  # get committer date, UNIX timestamp (%ct)
  thists=`git log $ix -n 1 --format=%ct`;
  prevts=`git log $ix~1 -n 1 --format=%ct 2>/dev/null`;
  if [ ! -z "$prevts" ] ; then
    delta=$(( $thists - $prevts ));
    # get substring of hash (#ix)
    hash=$(echo $ix | cut -c 1-7)
    # If want result write to file, change ; to >> output_file
    echo $hash \
         `date -d @$thists +'%Y-%m-%d %H:%M:%S'` "-->"  \
         `date -d @$prevts +'%Y-%m-%d %H:%M:%S'` " ;= " \
         `date -u -d @$delta +'%H:%M:%S'` ;
  fi;
done