GTM does not have NTP configured

Hello everyone: I found that the client GTM is not configured with NTP. The application is normal. I found the gtm log alarm today. At this time, the time of the master and backup devices is almost the same (Tue Mar 26 15:09:33 CST 2019 Active, 2019 Tue Mar 26 15:09:08 CST 2019 Standby), but it is often checked with the current actual time for 20 minutes. Is it possible to configure the NTP server directly?