Additional Code?

Dear All

I have this code on function.php ->

function jl_remove_post_dates() {
add_filter (‘the_date’, ‘__return_false’);
add_filter (‘the_time’, ‘__return_false’);
add_filter (‘get_the_date’, ‘__return_false’);
add_filter (‘get_the_time’, ‘__return_false’);
} add_action(‘loop_start’, ‘jl_remove_post_dates’);

But the date still appear on search engine.

If I install this plugin,
then I have to remove the code above, right?