Wraps 'git commit' command to override AuthorDate and CommitDate (if date is provided)

git-backcommit

#!/usr/bin/env bash

## Copyright 2020 Shivansh Saini<shivanshs9@gmail.com>
# Licensed under MIT

usage() {
    cat << EOD

Usage: `basename $0` [options] [date] -- [commit args]

  Available options:
    -h, --help           Display this help

  Wraps 'git commit' command to override AuthorDate and CommitDate (if date is provided)
EOD
}

while [ $# -gt 0 ]; do
  case "$1" in
    -h | --help)
      usage
      exit
      ;;
    --)
      shift
      break
      ;;
    *)
      adate="$1"
      shift
      ;;
  esac
done

cmd="git commit"
git_args=""
if [ $# -gt 0 ]; then
	git_args=$(printf "%q\n" "$@")
fi
if [[ -n "$adate" ]]; then
	cmd="GIT_COMMITTER_DATE=\"$adate\" $cmd --date \"$adate\""
fi
echo "Executing $cmd $git_args..."
eval $cmd $git_args

To commit dated "Jul 1 10:10:10 2020 +0530", run:

git backcommit "Fri Jul 1 10:10:10 2020 +0530"

To provide commit-specific options, run:

git backcommit "Fri Jul 1 10:10:10 2020 +0530" -- -m "commit message"