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    // Modules such as Date Repeat, as well as our parsing functions, generally

    // expect a single EXDATE entry for optimal operation. If we have multiple

    // entries in the data, we should concatenate them here.

    $parsed_exdate = trim(preg_replace('/\s/', '', $vcalendar_component->createExdate()));

    // First, get the individual contents of any definitions. It's OK even if

    // there is only one.

    $exdate_parts = explode('EXDATE;', $parsed_exdate);

    array_shift($exdate_parts); // First element always blank.

    // Extended parameters such as VALUE and TZID are set in the first EXDATE

    // The other ones must not repeat them. We skip the first entry when

    // enforcing this, obviously.

    $skip = TRUE;

    foreach ($exdate_parts as &$exdate_part) {

      if ($skip) {

        $skip = FALSE;

        continue;

      }

      // This strips off the part before the colon, since we only want the value

      // from the first EXDATE entry. end() wants a real array, hence why two

      // lines.

      $exdate_part_parts = explode(':', $exdate_part);

      $exdate_part = end($exdate_part_parts);

    }

    // Combine the parts back together with an EXDATE; specifier in front.

    $exdate = !empty($exdate_parts) ? 'EXDATE;' . implode(',', $exdate_parts) : '';