How to use ntp service

The Network Time Protocol is a networking protocol for clock synchronization between computer systems over packet-switched, variable-latency data networks. In operation since before 1985, NTP is one of the oldest Internet protocols in current use. NTP was designed by David L. Mills of the University of Delaware.
You can use ntp service for service and client such as linux ubuntu or windows 10. We discuss about this in the next paragraph.
To use ntp service in linux ubuntu system you need to open /etc/systemd/timesyncd.conf file using vim command and next you need to add ntp.homayouni.info in NTP= section. then save the timesyncd.conf file and then restart systemd-timesyncd.service using systemd (systemctl start systemd-timesyncd.service)