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In finance, a calendar spread (also called a time spread or horizontal spread) is a spread trade involving the simultaneous purchase of futures or options expiring on a particular date and the sale of the same instrument expiring on another date. These individual purchases, known as the legs of the spread, vary only in expiration date; they are based on the same underlying market and strike price.
The usual case involves the purchase of futures or options expiring in a more distant month--the far leg--and the sale of futures or options in a more nearby month--the near leg.