Edit the date of git tags to the dates of the associated commits, while keeping messages for annotated tags

tag_time_travel.sh

$ git tag -l | while read -r tag ; do COMMIT_HASH=$(git rev-list -1 $tag) COMMIT_MSG=$(git tag -l --format='%(contents)' $tag | head -n1) && GIT_COMMITTER_DATE="$(git show $COMMIT_HASH --format=%aD | head -1)" git tag -a -f $tag -m"$COMMIT_MSG" $COMMIT_HASH ; done

$ git tag -l -n1                      #check by listing all tags with first line of message

$ git push --tags --force             #push edited tags up to remote