Daytime Protocol (RFC 867 - http://www.faqs.org/rfcs/rfc867.html) is an older internet date and time system. It can be either TCP or UDP on port 13. Date and time is sent as an ASCII string.
Found on http://www.archivemag.co.uk/
[astronomy] On Earth, daytime is roughly the period on any given point of the planet`s surface during which it experiences natural illumination from indirect or (especially) direct sunlight. Other planets that rotate in relation to a luminous primary, such as a local star, also experience daytime of a sort, but this article primarily discus... Found on http://en.wikipedia.org/wiki/Daytime_(astronomy)