The daytime port 13 will return a datagram containing the server time.
On many systems, this port is being disabled, fearing hackers may use it to perform a denial-of-service attack of some sort. Based on the date format that the server returns, the hacker may also find out about the operating system.
Just open a socket and read a line. It will contain the server time if the port is enabled.
Author of answer: Joris Van den Bogaert
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