Calendar Spread
What Does Calendar Spread Mean?
An options or futures spread established by simultaneously entering a long and short position on the same underlying asset but with different delivery months. Sometimes referred to as an interdelivery, intramarket, time or horizontal spread.
Investopedia explains Calendar Spread
An example of a calendar spread would be going long on a crude oil futures contract with delivery next month and going short on a crude oil futures contract whose delivery is in six months.