Disable certain prodicts from being sold based on a custom ACF date field.

functions.php

<?php 
/**
 *
 *
 *
 */
function set_end_order_date ( $is_purchasable, $product ){

    // Set time zone
    //$timezone = date_default_timezone_set('Europe/London');
    $timezone = get_option('timezone_string'); 
    date_default_timezone_set($timezone);

    // Get product Id
    $product_id = $product->get_id();

    // For product variations (from variable products)
    if ( $product->is_type('variation') ){
        $parent = wc_get_product( $product->get_parent_id() );
        $product_id = $parent->get_id();
    } 

    // Get ACF date field from product
    //$end_order_date = get_field( 'end_order_date', $product_id );
    $end_order_date = get_post_meta($product_id, 'end_order_date', true );

    // Check logic if the end date is set
    if( $end_order_date ) {

        // Convert to new end date format because ACF is poop 
        $end_order_date_convert = date( "d-m-Y", strtotime($end_order_date) ); 

        // And then convert to timestamp
        $new_end_order_date = abs( strtotime( $end_order_date_convert ) ); 

        // get today's date in timestamp format
        $today_date = date("d-m-Y"); 
        $today_date = abs( strtotime($today_date) );

        // And then convert to timestamp
        $new_end_order_date = abs( strtotime( $end_order_date_convert ) );

        // check to see if ACF date has passed - if it has, remove "Add to cart"
        if ( $new_end_order_date < $today_date ) {
           //return false;
           $is_purchasable = false;
        }

    }

    return $is_purchasable;

}
add_filter('woocommerce_is_purchasable', 'set_end_order_date', 23, 2 );
//add_filter('woocommerce_variation_is_purchasable', 'set_end_order_date', 23, 2 );