Is there a way to schedule changes to a page?

you can do this with a shortcode like this

add_shortcode("custom_text_se282078", function ($attr, $content, $tag) {

    $result = "";

    if (date_i18n("H") > $attr["time"]) {
        $result = $attr["text_after"];
    } else {
        $result = $attr["text_before"];
    }

    return $result;

});

with that you just have to put that in the page :

[custom_text_se282078 time=”10″ text_before=”text before 10 h” text_after=”texte after 10 h”]