git filter-branch -f --env-filter \
    'if [ $GIT_COMMIT = dad723b0e1993e4626e4d91edcea101389bdd87e ]
     then
         export GIT_AUTHOR_DATE="Mon Nov 17 16:00:53 2014 +0000"
         export GIT_COMMITTER_DATE="Mon Nov 17 16:00:53 2014 +0000"
     fi'