The Daytime protocol (Daytime) is one of several time retrieval protocols, and although now overshadowed by the SNTP, was a popular choice on early microcomputers. Server access requires using a simple Daytime client (clock program). It is strongly recommended that Daytime servers never be queried more frequently than once every 6 seconds. Below are addresses to public Daytime servers.
[IANA Port assignment = 13]