git-log-times.sh

#!/bin/bash

cd ~/src
dir="git-long-uninteresting-branch"

git init $dir > /dev/null
cd $dir

export GIT_COMMITTER_DATE="1600000000"

seq 1 3 | while read n ; do
  echo "$n" > file.txt
  git add .
  git commit -m "master-$n"
done

git checkout -b topic master^

export GIT_COMMITTER_DATE="1500000000"

seq 1 7 | while read n ; do
  echo "$n" > file.txt
  git commit -am "topic-$n"
done

git log --oneline topic..master