hdr.ChangeTime = time.Unix(p.parseNumeric(star.changeTime()), 0)
		case format.has(FormatGNU):
			hdr.Format = format
			var p2 parser
			gnu := tr.blk.toGNU()
			if b := gnu.accessTime(); b[0] != 0 {
				hdr.AccessTime = time.Unix(p2.parseNumeric(b), 0)
			}
			if b := gnu.changeTime(); b[0] != 0 {
				hdr.ChangeTime = time.Unix(p2.parseNumeric(b), 0)
			}

		}
		if got, want := h2.AccessTime, v.h.AccessTime; got != want {
			t.Errorf("i=%d: AccessTime: got %v, want %v", i, got, want)
		}
		if got, want := h2.ChangeTime, v.h.ChangeTime; got != want {
			t.Errorf("i=%d: ChangeTime: got %v, want %v", i, got, want)
		}
		if got, want := h2.ModTime, v.h.ModTime; got != want {
			t.Errorf("i=%d: ModTime: got %v, want %v", i, got, want)
		}

	// to the nearest second and ignores the AccessTime and ChangeTime fields.
	//
	// To use AccessTime or ChangeTime, specify the Format as PAX or GNU.
	// To use sub-second resolution, specify the Format as PAX.
	ModTime    time.Time // Modification time
	AccessTime time.Time // Access time (requires either PAX or GNU support)
	ChangeTime time.Time // Change time (requires either PAX or GNU support)

			h.Gname = g.(string)
		} else if g, err := user.LookupGroupId(strconv.Itoa(h.Gid)); err == nil {
			h.Gname = g.Name
			groupMap.Store(h.Gid, h.Gname)
		}
	}
	h.AccessTime = statAtime(sys)
	h.ChangeTime = statCtime(sys)

	// Best effort at populating Devmajor and Devminor.
	if h.Typeflag == TypeChar || h.Typeflag == TypeBlock {
		dev := uint64(sys.Rdev) // May be int32 or uint32
		switch runtime.GOOS {
		case "aix":

//	Uid/Gid           | uint21 | unlimited |    uint57
//	Uname/Gname       |    32B | unlimited |       32B
//	ModTime           | uint33 | unlimited |     int89
//	AccessTime        |    n/a | unlimited |     int89
//	ChangeTime        |    n/a | unlimited |     int89
//	Devmajor/Devminor | uint21 |    uint21 |    uint57
//	------------------+--------+-----------+----------
//	string encoding   |  ASCII |     UTF-8 |    binary

	blk := tw.templateV7Plus(hdr, f.formatString, f.formatNumeric)
	if !hdr.AccessTime.IsZero() {
		f.formatNumeric(blk.toGNU().accessTime(), hdr.AccessTime.Unix())
	}
	if !hdr.ChangeTime.IsZero() {
		f.formatNumeric(blk.toGNU().changeTime(), hdr.ChangeTime.Unix())
	}
	// TODO(dsnet): Re-enable this when adding sparse support.
	// See https://golang.org/issue/22735
	/*
		if hdr.Typeflag == TypeGNUSparse {

			AccessTime: time.Unix(1244592783, 0),
			ChangeTime: time.Unix(1244592783, 0),
		}, {
			Name:       "small2.txt",
			Mode:       0640,
			Uid:        73025,
			Gid:        5000,
			Size:       11,
			ModTime:    time.Unix(1244592783, 0),
			Typeflag:   '0',
			Uname:      "dsymonds",
			Gname:      "eng",
			AccessTime: time.Unix(1244592783, 0),
			ChangeTime: time.Unix(1244592783, 0),
		}},
	}, {

pkg archive/tar, method (*Writer) WriteHeader(*Header) error
pkg archive/tar, type Header struct
pkg archive/tar, type Header struct, AccessTime time.Time
pkg archive/tar, type Header struct, ChangeTime time.Time
pkg archive/tar, type Header struct, Devmajor int64
pkg archive/tar, type Header struct, Devminor int64
pkg archive/tar, type Header struct, Gid int
pkg archive/tar, type Header struct, Gname string