diff --git a/webapp/models/RealtimeData.php b/webapp/models/RealtimeData.php
index 476cada0..85e72208 100644
--- a/webapp/models/RealtimeData.php
+++ b/webapp/models/RealtimeData.php
@@ -23,8 +23,15 @@ class RealtimeData extends BaseModel {
     public static function getServerDays()
     {
         if (is_null(self::$serverDays)){
-            $db = self::internalGet('server_days');
-            self::$serverDays = max(1, $db ? $db['value1']: 0);
+            $row = self::internalGet('open_service_time');
+            if ($row) {
+                $nowDaySeconds = myself()->_getNowDaySeconds();
+                $openDaySeconds = myself()->_getDaySeconds($row['value1']);
+                $passDays = ($nowDaySeconds - $openDaySeconds) / 3600 / 24;
+                self::$serverDays = 1 + max($passDays, 0);
+            } else {
+                self::$serverDays = 1;
+            }
         }
         return  self::$serverDays;
     }