Remove datePublished markup on BlogPosting https://schema.press/remove-datepublished-markup-posts/

schema-remove-datePublished.php

<?php //* do not include php tag

add_filter('schema_output', 'remove_datePublished_markup_588545256');
/**
 * Schema Plugin: Remove datePublished markup on BlogPosting
 *
 * @since 1.0
 */
function remove_datePublished_markup_588545256( $schema ) {
	
	// If markup is for BlogPosting,
	// return our $json array and do not do anything
	if ( isset($schema['@type']) && $schema['@type'] != 'BlogPosting' ) return $schema;
	
	// Unset the published date
	unset( $schema["datePublished"] );
  
	// Unset the modified date (last updated date)
	unset( $schema["dateModified"] );
		 
	return $schema;
}