NTP and NTS server synced over NTS to Cloudflare, Netnod, PTB and time.nl, and to kz.pool.ntp.org.
services.chrony = {
enable = true;
enableNTS = true;
servers = [ "ntp.nixos.kz" ];
};Plain NTP with the default systemd-timesyncd:
networking.timeServers = [ "ntp.nixos.kz" ];