When running a site through Search Console, Google started crying and complaining that I didn’t have author or date micro data.  Boo frickin’ hoo! 😉

Anywho I search for a while, tried a few things and found this code that fixes it:

Add this to your functions.php in your CHILD theme (you better be using a child theme, mister!)

//code to make google search console happy about microdata
function add_atom_data($content) {
$t = get_the_modified_time('F jS, Y');
$author = get_the_author();
$title = get_the_title();
if (is_home() || is_singular() || is_archive() ) {
$content .= '<div class="hatom-extra" style="display:none;visibility:hidden;"><span class="entry-title">'.$title.'</span> was last modified: <span class="updated"> '.$t.'</span> by <span class="author vcard"><span class="fn">'.$author.'</span></span></div>';
return $content;
add_filter('the_content', 'add_atom_data');

It’s here: https://thomas.vanhoutte.be/miniblog/missing-updated-wordpress/