I configured Chorony server side on Centos 8 then I tried to sync time with client with linux and got this result

RTC time seems like synced but Local time not synced. How to sync the time with local time too? Firewall disabled on both server/client side so 123 port is open.

On the centos /chronyc server/ side I added 4 server:
What means sign?

The ? means the system lost communication with the server or something was wrong with the ntp data packets.

The 377 (in the fourth column of data) indicates the system was actually communicating and the queries were successful, 0 means nothing was every received.

The RTC is the battery backed hardware clock and the system thinks it should be set to UTC. Normally when the computer boots it reads and sets the system time using the RTC. Eventually when the network is up chronyc updates the time when connected to a time server. Actually the system is set to UTC and the timezone setting is used to display local time.

ntp.gnc.am and time.cloudflare.com may be a networking problem.

How are the 192.168.1.2 and 192.168.1.10 syncing their time? Are they running ntp?

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Thanks for your reply.
Can we determine what was wrong with data packet?

Can I set RTC to local time?

The centos 8 which I installed chrony as server is not syncing the time from the Internet. Is that problem persist on client side?

One of them is working Windows ntp server.
Second one is linux based chrony server.

Yes, but in general time syncing works much better if it set to UTC. The system clock is UTC regardless of timezone or RTC clock setting. However, you do need to tell the operating system which setting you are using so the system clock is set correctly. In addition, there is no conflict during DST time changes. If your not using DST then it probably does not matter.

It can persist. If the server clock drifts a lot the client does not trust the server and will not use it as a source.

Is the Windows time server not syncing to the internet?

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Windows ntp server is syncing from internet correctly. It was configured as time.windows.com
But it is used a lot of devices.

I have not really played with using Windows as a time source.

What Windows version are you running? Is it specifically configured i.e. registry settings modified etc to be a time server?

On any modern OS, it is mandatory that the system bios time is set to UTC. Then when you set the local time zone the system time is properly displayed as local time. That is how the OS manages time. It is also how NTP keeps times synced. The OS displays time as local time, but under the hood it manages UTC time.

Any properly configured and synced time server (windows, linux, or other) will also use utc to sync with its clients.

Attempting any other config is simply asking for problems in time sync with the internet time servers and display on the OS.

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As an aside... Many embedded systems like the Pi do not even have a hardware clock and the only purpose for the hardware clock is to set the system time. Now days when everybody is connected to the internet its less important IMHO. But if you do have a RTC make sure it is set correctly. ntp does not care about the RTC. With most configurations ntp at start forces the system clock to sync to an absolute time regardless.

There are certain conditions like DST that complicates conversion from local to UTC when the hardware clock is set to local time but should be fixed when ntp is synced.

That was problem, I installed as new server with ubuntu. That ubuntu's chronyc is syncing from the internet, then syncing to the local are connection.
Thank you guys.