anchor.diff:    keyFile = "${stateDir}/chrony.keys";
   
     configFile = pkgs.writeText "chrony.conf" ''
  -    ${concatMapStringsSep "\n" (server: "server " + server + " iburst") cfg.servers}
  +    ${concatMapStringsSep "\n" (server: "server " + server + " iburst" + optionalString (cfg.enableNTS) " nts") cfg.servers}
   
       ${optionalString
         (cfg.initstepslew.enabled && (cfg.servers != []))
  
positive.code:         default = config.networking.timeServers;
          description = ''
            The set of NTP servers from which to synchronise.
          '';
        };
  
  
negative.code: 
      driftfile ${driftFile}
      keyfile ${keyFile}
      ${optionalString (cfg.enableNTS) "ntsdumpdir ${stateDir}"}
  
      ${optionalString (!config.time.hardwareClockInLocalTime) "rtconutc"}
  
  