Last Updated Date Showing Css Script:
// By Shridas Kadam
add_filter( 'generate_post_date_output', function( $output, $time_string ) {
$time_string = '';
if ( get_the_date() !== get_the_modified_date() ) {
$time_string = '';
}
$time_string = sprintf( $time_string,
esc_attr( get_the_date( 'c' ) ),
esc_html( get_the_date() ),
esc_attr( get_the_modified_date( 'c' ) ),
esc_html( get_the_modified_date() )
);
return sprintf( '%s ',
$time_string
);
}, 10, 2 );