code: public static base_responses update(nitro_service client, ntpserver resources[]) throws Exception {
  		base_responses result = null;
  		if (resources != null && resources.length > 0) {
  			ntpserver updateresources[] = new ntpserver[resources.length];
  			for (int i=0;i<resources.length;i++){
  				updateresources[i] = new ntpserver();
  				updateresources[i].serverip = resources[i].serverip;
  				updateresources[i].servername = resources[i].servername;
  				updateresources[i].minpoll = resources[i].minpoll;
  				updateresources[i].maxpoll = resources[i].maxpoll;
  				updateresources[i].preferredntpserver = resources[i].preferredntpserver;
  				updateresources[i].autokey = resources[i].autokey;
  				updateresources[i].key = resources[i].key;
  			}
  			result = update_bulk_request(client, updateresources);
  		}
  		return result;
  	}
docs: Use this API to update ntpserver resources.