git filter-branch --env-filter \
    '
    x=$(date --date="@$(echo $(( `date +%s` * $RANDOM % 4294967295 )))" +"%a %b %d %H:%M:%S %Y %z")
    export GIT_AUTHOR_DATE="$x"
    export GIT_COMMITTER_DATE="$x"
'   last-rewrite..HEAD

Generated At 2023-07-12T21:05:38-0700 original