diff --git a/src/Drupal/Driver/Fields/Drupal8/DatetimeHandler.php b/src/Drupal/Driver/Fields/Drupal8/DatetimeHandler.php
index 435e42f2..006db8fc 100644
--- a/src/Drupal/Driver/Fields/Drupal8/DatetimeHandler.php
+++ b/src/Drupal/Driver/Fields/Drupal8/DatetimeHandler.php
@@ -12,7 +12,14 @@ class DatetimeHandler extends AbstractHandler {
    */
   public function expand($values) {
     foreach ($values as $key => $value) {
-      $values[$key] = str_replace(' ', 'T', $value);
+      if (strpos($value, "relative:") !== FALSE) {
+        $relative = trim(str_replace('relative:', '', $value));
+        // Get time, convert to ISO 8601 date in GMT/UTC, remove TZ offset.
+        $values[$key] = substr(gmdate('c', strtotime($relative)), 0, 19);
+      }
+      else {
+        $values[$key] = str_replace(' ', 'T', $value);
+      }
     }
     return $values;
   }