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Making an ics calendar with ACF date

  • I have a custom post type called ‘competicions’, with ACF for date and time (format d/m/Y | H:i). Is there any way to create an ics calendar from this posts and make it autoupdatable like all ics calendars?

    I tried following code but it is not working, it loads an empty calendar.

    -Custom post type: competicions

    -Start/End date: ACF datahora_prova

    -Observations: link to the post.

    Here is my code:

    Plugin Name: ical feed
    // UTILS
    // Check if string is a timestamp
    function isValidTimeStamp($timestamp) {
        //if($timestamp == '') return;
        return ((string) (int) $timestamp === $timestamp) 
            && ($timestamp <= PHP_INT_MAX)
            && ($timestamp >= ~PHP_INT_MAX);
    // Escapes a string of characters
    function escapeString($string) {
        return preg_replace('/([\,;])/','\\\$1', $string);
    // Shorten a string to desidered characters lenght - eg. shorter_version($string, 100);
    function shorter_version($string, $lenght) {
    if (strlen($string) >= $lenght) {
            return substr($string, 0, $lenght);
        } else {
            return $string;
    // Add a custom endpoint "calendar"
    function add_calendar_feed(){
        add_feed('icalfeed', 'export_ics');
        // Only uncomment these 2 lines the first time you load this script, to update WP rewrite rules, or in case you see a 404
    global $wp_rewrite;
    $wp_rewrite->flush_rules( false );
    add_action('init', 'add_calendar_feed');
    // Calendar function
    function export_ics(){
        // Query the event
        $the_event = new WP_Query(array(
            'p' => $_REQUEST['id'],
            'post_type' => 'competicions',
        if($the_event->have_posts()) :
            while($the_event->have_posts()) : $the_event->the_post();
            // If your version of WP < 5.3.0 use the code below
            /*  The correct date format, for ALL dates is date_i18n('Ymd\THis\Z',time(), true)
                So if your date is not in this format, use that function    */
            $start_date = get_field("datahora_prova", false, false); // EDIT THIS WITH YOUR OWN VALUE
            $end_date = get_field("datahora_prova", false, false); // EDIT THIS WITH YOUR OWN VALUE
            // The rest is the same for any version
            $timestamp = date_i18n('Ymd\THis\Z',time(), true);
            $uid = get_the_ID();
            $created_date = get_post_time('Ymd\THis\Z', true, $uid );
            $organiser = get_bloginfo('name'); // EDIT THIS WITH YOUR OWN VALUE
            $address = ''; // EDIT THIS WITH YOUR OWN VALUE
            $url = get_the_permalink();
            $summary = get_the_excerpt();
            $content = html_entity_decode(trim(preg_replace('/\s\s+/', ' ', get_the_content()))); // removes newlines and double spaces
            $title = html_entity_decode(get_the_title());
            //Give the iCal export a filename
            $filename = urlencode( $title.'-ical-' . date('Y-m-d') . '.ics' );
            $eol = "\r\n";
            //Collect output
            // Set the correct headers for this file
            header("Content-Description: File Transfer");
            header("Content-Disposition: attachment; filename=".$filename);
            header('Content-type: text/calendar; charset=utf-8');
            header("Pragma: 0");
            header("Expires: 0");
    // The below ics structure MUST NOT have spaces before each line
    // Credit for the .ics structure goes to
    PRODID:-//<?php echo get_bloginfo('name'); ?> //NONSGML Events //EN
    X-WR-CALNAME:<?php echo get_bloginfo('name').$eol;?>
    CREATED:<?php echo $created_date.$eol;?>
    UID:<?php echo $uid.$eol;?>
    DTEND;VALUE=DATE:<?php echo $end_date.$eol; ?>
    DTSTART;VALUE=DATE:<?php echo $start_date.$eol; ?>
    DTSTAMP:<?php echo $timestamp.$eol; ?>
    LOCATION:<?php echo escapeString($address).$eol; ?>
    DESCRIPTION:<?php echo $content.$eol; ?>
    SUMMARY:<?php echo $title.$eol; ?>
    ORGANIZER:<?php echo escapeString($organiser).$eol;?>
    URL;VALUE=URI:<?php echo escapeString($url).$eol; ?>
    TRIGGER;VALUE=DATE-TIME:<?php echo $deadline.$eol; ?>
    DESCRIPTION:Reminder for <?php echo escapeString(get_the_title()); echo $eol; ?>
            //Collect output and echo
            $eventsical = ob_get_contents();
            echo $eventsical;
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