Expire posts to draft using a datepicker field in ACF

functions.php

// Expire events
if ($expireTransient = get_transient($post->ID) === false) {
	set_transient($post->ID, 'set for 1 minutes', 1 * MINUTE_IN_SECONDS );
	$today = date('Y-m-d H:i:s', current_time('timestamp', 0));
	$args = array(
		'post_type' => 'events',
		'posts_per_page' => 200,
		'post_status' => 'publish',
		'meta_query' => array(
			array(
				'key' => 'end_date_time',
				'value' => $today,
				'compare' => '<='
			)
		)
	);
	$posts = get_posts($args);
	foreach( $posts as $post ) {
		if(get_field('end_date_time', $post->ID)) {
			$postdata = array(
				'ID' => $post->ID,
				'post_status' => 'draft'
			);
			wp_update_post($postdata);
		}
	}
}

Hi Luke,

First of all, great piece of code! Really does what I need it to do.
Having said that, in debug mode the 2nd line of this code gives me some errors.

Notice: Undefined variable: post and Notice: Trying to get property of non-object.

I was wondering if you could tell me how to get rid of this error?
I just don’t understand why it’s giving me an error while the code works.
Trying to wrap the whole thing in a function and then adding global $post; at the start. This makes the errors go away, but then the code doesn’t do its thing anymore.

Looking forward to hearing from you!

Kind regards,
Sarthak Priyadarshan

Thank you for this code, I use it often. Most of my sites I host on Siteground and have no issue, but for some reason this will not work on AWS Lightsail or EC2. Would you have any advice or idea why that might be?