Usage: ./git-commit-modify-last-time.sh <date(like: Tue, 07 Feb 2017 07:00:00 +0800)>

git-commit-modify-last-time.sh

#!/usr/bin/env bash
git stash && \
date=$(date -d "$1" +%s) && \
rm -rf "$(git rev-parse --git-dir)/refs/original/" && \
git filter-branch --env-filter \
"if [ \$GIT_COMMIT = \"$(git rev-parse HEAD)\" ]; then
    export GIT_AUTHOR_DATE=\"$date\"
    export GIT_COMMITTER_DATE=\"$date\"
    export GIT_COMMITTER_NAME=\$GIT_AUTHOR_NAME
    export GIT_COMMITTER_EMAIL=\$GIT_AUTHOR_EMAIL
fi" && \
git stash pop