diff --git a/lib/Analytics/Reporter.php b/lib/Analytics/Reporter.php
index 8fb815d42a..33bc9ef1fc 100644
--- a/lib/Analytics/Reporter.php
+++ b/lib/Analytics/Reporter.php
@@ -1,7 +1,7 @@
 <?php
 namespace MailPoet\Analytics;
 
-use \DateTime;
+use Carbon\Carbon;
 use MailPoet\Config\ServicesChecker;
 use MailPoet\Cron\CronTrigger;
 use MailPoet\Models\Newsletter;
@@ -107,9 +107,9 @@ class Reporter {
     $newletters = Newsletter::getAnalytics();
     $segments = Segment::getAnalytics();
     $mta = $this->settings->get('mta', []);
-    $installed_at = new DateTime($this->settings->get('installed_at'));
+    $installed_at = new Carbon($this->settings->get('installed_at'));
     return [
-      'installedAtIso' => $installed_at->format(DateTime::ISO8601),
+      'installedAtIso' => $installed_at->format(Carbon::ISO8601),
       'newslettersSent' => $newletters['sent_newsletters_count'],
       'welcomeEmails' => $newletters['welcome_newsletters_count'],
       'postnotificationEmails' => $newletters['notifications_count'],