Correct time plays a critical role in the operation of servers, computers and many other network devices connected to the Internet. Below you can see List of Public Time Servers.
The NTP pool project is a big virtual cluster of timeservers providing reliable easy to use NTP service.
pool.ntp.org is a best NTP servers pool because usually returns IP addresses of NTP servers close to your location.
Cloudflare NTP Server
Google NTP Servers
Microsoft NTP Server
Apple NTP Server
You just got acquainted with the list of the best public NTP servers. In the settings of your devices, it is desirable to add two time servers.