如何修改CPT Calendar Widget插件，使其调用ACF日期字段而非发布日期

Got it, let's walk through how to adjust this plugin to work with your ACF date picker fields instead of the default post publish date.

First, a quick recap: WordPress' built-in calendar doesn't support Custom Post Types (CPTs), so you're using the CPT Calendar Widget—but right now it only pulls dates from post publish times, not the start/end dates you've set via Advanced Custom Fields. Here's how to tweak the code:

Step 1: Locate the Query Logic in the Plugin #

Open the main plugin code file and find the section where it fetches CPT posts (usually a function that sets up a WP_Query or pulls posts for the calendar display).

Step 2: Replace the Date Query with ACF Fields #

Instead of relying on the post_date field, we'll use ACF's meta fields to filter and fetch posts. Let's assume your ACF start date field key is event_start and end date is event_end—swap these with your actual field keys if they're different:

// Update the WP_Query arguments to target ACF date fields
$args = array(
    'post_type'      => $cpt_types, // This variable should already exist in the plugin
    'posts_per_page' => -1,
    'meta_query'     => array(
        'relation' => 'AND',
        array(
            'key'     => 'event_start',
            'compare' => 'EXISTS' // Ensure the field has a value set
        ),
        array(
            'key'     => 'event_end',
            'compare' => 'EXISTS'
        )
    )
);
$calendar_posts = new WP_Query( $args );

Step 3: Map Posts to Calendar Dates Using ACF Values #

Next, find the part of the code that assigns posts to specific calendar dates (it probably uses $post->post_date or get_the_date()). Replace that with logic that uses your ACF start/end dates:

// Loop through each fetched post
if ( $calendar_posts->have_posts() ) {
    while ( $calendar_posts->have_posts() ) {
        $calendar_posts->the_post();
        
        // Pull ACF date values for the current post
        $start_date = get_field( 'event_start', get_the_ID() );
        $end_date = get_field( 'event_end', get_the_ID() );
        
        // Convert dates to timestamps for easy date range iteration
        $start_ts = strtotime( $start_date );
        $end_ts = strtotime( $end_date );
        
        // Add the post to every date between start and end (inclusive)
        for ( $current_ts = $start_ts; $current_ts <= $end_ts; $current_ts += 86400 ) {
            $date_key = date( 'Y-m-d', $current_ts );
            $calendar_events[ $date_key ][] = get_the_ID(); // Or store the full post object if needed
        }
    }
    wp_reset_postdata();
}

Step 4: Test and Adjust #

Save your changes, then refresh your site to check the calendar. A few quick notes:

• Make sure your ACF date fields are set to a format that strtotime() can parse (like Y-m-d or Ymd—you can adjust this in the ACF field settings).
• If you only use a single date field (no end date), remove the event_end part of the meta_query and just map the post to the start date directly.

内容的提问来源于stack exchange，提问作者TechRemarker