_update_blog_date_on_post_publish( string $new_status, string $old_status, object $post )

Handler for updating the site’s last updated date when a post is published or an already published post is changed.

Parameters

$new_status

(Required) The new post status

$old_status

(Required) The old post status

$post

(Required) Post object

Source

File: wp-includes/ms-blogs.php 

function _update_blog_date_on_post_publish( $new_status, $old_status, $post ) {
	$post_type_obj = get_post_type_object( $post->post_type );
	if ( ! $post_type_obj || ! $post_type_obj->public ) {
		return;
	}

	if ( 'publish' != $new_status && 'publish' != $old_status ) {
		return;
	}

	// Post was freshly published, published post was saved, or published post was unpublished.

	wpmu_update_blogs_date();
}

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Related

Changelog

Changelog
Version Description
WP-3.3.0 Introduced.