`update_post_meta` not working anymore

get_the_ID() is a “Loop” function. It won’t outside the Loop, and there is not Loop in your code. Essentially, you are passing a bad ID to the function causing it to fail. If you had debugging enabled you might see feedback to that effect.

You are also using a variable– $dateStart— that is not set in the context of the function.

You are not properly using the save_post hook, however. WordPress will pass the post ID through to your callback if you ask for it.

Finally, what you want is global $_POST; which is the PHP form data, and not global $post; with is a WordPress variable that is a primary component of Loops.

function cpt_event_save_data($pid) {
    global $_POST;
    $dateStart = $_POST['date-start']; 
    // sanitize $datestart, maybe with PHP's checkdate()
    // I don't know what the format of your string is though
    update_post_meta($pid, "date-start", $dateStart);
}

Untested, but that should be pretty close.

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