`--date=default` shows timestamps in the original timezone
(either committer's or author's).
Print the contents of the commit in raw-format; each record is
separated with a NUL character.
Print the parents of the commit.
Print the raw commit timestamp.
Pretend as if all the refs in `$GIT_DIR/refs/` are listed on the
command line as '<commit>'.
In addition to the '<commit>' listed on the command
test the exit status to see if a range of objects is fully
connected (or not). It is faster than redirecting stdout
to /dev/null as the output does not have to be formatted.