What is the oldest daily newspaper in Israel?
The Jesus Times
It can be either. If it modifies a noun like "newspaper", as in, "I get a daily newspaper." Then it's an adjective that tells what kind of "newspaper" If it modifies a verb, adjective or another adverb then it's an adverb. In the sentence, "I walk daily." The word "daily" is an adverb that tells more about the action "walk"
A daily newspaper (such as the Daily Mail), is published every day of the week, and sometimes even has a special Sunday edition (such as the Mail on Sunday). A weekly newspaper, however, appears only once a week. An example of this would be the Essex County Standard, traditionally published on Fridays.