diff --git a/lockr.install b/lockr.install
index 9c6f7e2..ca6090d 100644
--- a/lockr.install
+++ b/lockr.install
@@ -96,19 +96,19 @@ function lockr_requirements($phase) {
       $warn = new DateInterval('P2M');
       $err = new DateInterval('P1W');

-      if ($now->add($warn) < $cert_expires) {
+      if ($now->add($warn)->getTimestamp() < $cert_expires) {
         $severity = REQUIREMENT_OK;
         $value = t('Lockr connection certificate does not expire soon.');
       }
-      elseif ($now->add($warn) > $cert_expires) {
+      elseif ($now->add($warn)->getTimestamp() > $cert_expires) {
         $severity = REQUIREMENT_WARNING;
         $value = t('The Lockr connection certificate expiration is in less than 2 months. Please renew it soon to prevent loss of connection to the service.');
       }
-      elseif ($now->add($err) > $cert_expires) {
+      elseif ($now->add($err)->getTimestamp() > $cert_expires) {
         $severity = REQUIREMENT_ERROR;
         $value = t('The Lockr connection certificate expiration is in less than 1 week. Please renew it now to prevent loss of connection to the service.');
       }
-      elseif ($now > $cert_expires) {
+      elseif ($now->getTimestamp() > $cert_expires) {
         $severity = REQUIREMENT_ERROR;
         $value = t('The Lockr connection certificate has expired. Please remove it and create a new one immediately to recover connection to service.');
       }
diff --git a/src/Controller/LockrAdminController.php b/src/Controller/LockrAdminController.php
index 78f0e26..250e642 100644
--- a/src/Controller/LockrAdminController.php
+++ b/src/Controller/LockrAdminController.php
@@ -355,11 +355,11 @@ class LockrAdminController implements ContainerInjectionInterface {
       }
       $now = new DateTimeImmutable();
       $err = new DateInterval('P1W');
-      if ($now->add($err) > $auth_info['expires']) {
+      if ($now->add($err)->getTimestamp() > $auth_info['expires']) {
         return REQUIREMENT_ERROR;
       }
       $warn = new DateInterval('P1M');
-      if ($now->add($warn) > $auth_info['expires']) {
+      if ($now->add($warn)->getTimestamp() > $auth_info['expires']) {
         return REQUIREMENT_WARNING;
       }
       return REQUIREMENT_OK;