7 is central time. (Middle US) and 8 is the eastern time zone. (Which is the default for most tv companies.) The east is one hour ahead of central due to Benjamin Franklin's brilliant idea.
It was daylight savings times you are thinking of that were referenced by Ben Franklin- but in a satirical essay, he never thought the idea would actually be implemented. Check out snopes! http://www.snopes.com/science/daylight.asp
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