Use OC_Util::formatDate()

settings/templates/admin.php

@@ -157,7 +157,7 @@ if (!$_['internetconnectionworking']) {
 	<?php if ($_['cron_log']): ?>
 	<p class="cronlog inlineblock">
 		<?php if ($_['lastcron'] !== false):
-			$human_time = date('Y-m-d H:i', $_['lastcron']) . " UTC";
+			$human_time = OC_Util::formatDate($_['lastcron']) . " UTC";
 			if (time() - $_['lastcron'] <= 3600): ?>
 				<span class="cronstatus success"></span>
 				<?php p($l->t("Last cron was executed at %s.", array($human_time)));