char zTmDiff[20];
  static const char *const azTimeFormats[] = {
      "0", "HH:MM",
      "1", "HH:MM:SS",
      "2", "YYYY-MM-DD HH:MM",
      "3", "YYMMDD HH:MM",
      "4", "(off)"
  };
  static const char *const azCommentFormats[] = {
      "0", "[hash] comment (details)",
      "1", "[hash] comment",
      "2", "comment [hash] (details)",
      "3", "comment [hash]",
      "4", "comment (details)",
      "5", "comment-only",
  };
  login_check_credentials();
  if( !g.perm.Setup ){
    login_needed(0);
    return;
  }

  style_header("Timeline Display Preferences");
  db_begin_transaction();
  @ <form action="%s(g.zTop)/setup_timeline" method="post"><div>
  login_insert_csrf_secret();
  @ <p><input type="submit"  name="submit" value="Apply Changes" /></p>

  @ <hr />
  multiple_choice_attribute("Comment Format", "timeline-comment-format",
            "tcf", "0", count(azCommentFormats)/2, azCommentFormats);
  @ <p>Each timeline entry may contain the following subsections:
  @ <ol>
  @ <li> an artifact hash with a hyperlink to a detail page
  @ <li> the check-in comment or other text describing the item
  @ <li> details, such as the user, branch, tags, etc.
  @ </ol>
  @ This control selects which of the three items above are included on each
  @ timeline entry and the order in which they are displayed.
  @ (Preperty: "timeline-commit-format")</p>

  @ <hr />
  onoff_attribute("Allow block-markup in timeline",
                  "timeline-block-markup", "tbm", 0, 0);
  @ <p>In timeline displays, check-in comments can be displayed with or
  @ without block markup such as paragraphs, tables, etc.
  @ (Property: "timeline-block-markup")</p>