WordPress Query display only posts modified today

Question

I'm trying to create a query in WordPress that displays only the posts that were edited today, excluding those posted today. I've tried several variations but nothings seem to be working:

$today = current_time('Ymd');

$args = array(
    'post_type' => 'post',
    'post_status' => 'publish',
    'posts_per_page' => '10',
    'meta_query' => array(
        array(
            'key' => 'modified',
            'compare' => '>=',
            'value' => $today,
            'type' => 'NUMERIC,'
            )
    ),
    'orderby' => 'modified',
    'order' => 'DESC',
    'ignore_sticky_posts' => '1'
);

I'm not quite sure what to put in key, although that isn't the only problem.

Answer 1

If I get it right, with "displays only the posts that were edited today, excluding those posted today."

I guess you mean display ONLY old published posts modified/edited today.

If that is the case, this might help you:

<?php
    // query args
    $args = array(
            'posts_per_page'        => '10',
            'post_type'             => 'post',
            'post_status'           => 'publish',
            'orderby'               => 'modified',
            'order'                 => 'DESC',
            'ignore_sticky_posts'   => '1',
            'caller_get_posts'      => 1
    );

    // query
    $updated = new WP_Query($args);

    // loop
    while($updated->have_posts()) : $updated->the_post(); 

    $today = current_time('Y-m-d'); // current date a.k.a. TODAY
    $pub = get_the_time('Y-m-d', $updated->ID); // date when post was published
    $mod = get_the_modified_time('Y-m-d', $updated->ID); // date when post was last modified

    // if post NOT published today AND was modified today display: 
    if ( $pub !== $today && $mod === $today ) :
?>

<!-- here goes your normal wp game -->
<h1><?php the_title ?></h1>
<span><?php the_date(); ?></span>
<p><?php the_excerpt(); ?></p>

<?php endif; endwhile; ?>