This is tar's output when listing files in a tarball:

> tar zvtf my.tar.gz
-rw-rw-r-- myuser/mygroup  2363 2018-05-03 15:45 test.txt

Is there any way to customize the date format to print out high-res epoch seconds, like "1537492797.82289"?

The version of tar is:

> tar --version
tar (GNU tar) 1.23

No, there isn't any, at least not with gnu tar.

Here is how the date is formatted (tartime() in tree/src/list.c)

if (tm)
    if (full_time)
        strftime (buffer, sizeof buffer, "%Y-%m-%d %H:%M:%S", tm);
        code_ns_fraction (ns, buffer + strlen (buffer));
        strftime (buffer, sizeof buffer, "%Y-%m-%d %H:%M", tm);
    return buffer;

And here is how the file header is printed (simple_print_header() in tree/src/list.c):

fprintf (stdlis, "%s %s/%s %*s %-*s",
         modes, user, group, ugswidth - pad + sizelen, size,
         datewidth, time_stamp);
  • Thank you for backing up your answer with the tar source.
    – Elle Fie
    Oct 2 '18 at 13:35

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