Incorrect time in Omnia

Hello,
I was using standard time settings - ntp synchronized with ntp.nic.cz,

Today early morning I noticed that date was jumping to Jul 01, time was correct and still the same (0:35 or something like that).

I restarted ntp service, tried reboot but still the same. After I switched to time.apple.com it looks correct.

Has anyone experienced something similar? I even not sure if it was problem of ntp server or something on Omnia.

The server seems to return correct time, at least at this moment. My Omnia has good time, but I have default servers which are different, I think.

Which are those default, 0.cz.pool.ntp.org - 3.cz.pool.ntp.org?

Currently time is OK, not sure what was problem.

XX.openwrt.pool.ntp.org, probably: https://gitlab.labs.nic.cz/turris/turris-os-packages/issues/142