fixes #5358 When looking for websites for which the local time, has m…

…oved into a new day then we should use the timestamp of the last time the archiving was executed successfully.

Previous code would not work as expected, in case for example: archiving runs once a day around midnight.

core/CronArchive.php

@@ -987,7 +987,7 @@ private function addWebsiteIdsWithVisitsSinceLastRun()
      */
     private function getTimezonesHavingNewDay()
     {
-        $timestamp = time() - $this->shouldArchiveOnlySitesWithTrafficSince;
+        $timestamp = $this->lastSuccessRunTimestamp;
         $uniqueTimezones = APISitesManager::getInstance()->getUniqueSiteTimezones();
         $timezoneToProcess = array();
         foreach ($uniqueTimezones as &$timezone) {