A common use of the calendar spread is to "roll over" an expiring position into the future.

The calendar spread can be used to attempt to take advantage of a difference in the implied volatilities between two different months' options.

This is also called a time spread, a horizontal spread, an intermonth spread, an interdelivery spread or a calendar spread.

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If the trader instead buys a nearby month's options in some underlying market and sells that same underlying market's further-out options of the same striking price, this is known as a reverse calendar spread.

An investor would be advised to buy the spread in these circumstances: this is a calendar spread trade where the trader buys the near-dated instrument and simultaneously sells the far-dated instrument (ie the future).

The calendar call spread (see calendar spread) is a bullish strategy and consists of selling a put option with a shorter expiration against a purchased call option with an expiration further out in time.

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 at particular date and the sale of the same instrument expiring another date.