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Option settlement for calendar spreads
First off, you should phone your broker and ask them just to be 100% certain. You will be exercised on the short option that was in the money. It is irrelevant that your portfolio does not contain AAPL stock. You will simply be charged the amount it costs to purchase the shares that you owe. I believe your broker would just take this money from your margin/cash account, they would not have let you put the position on if your account could not cover it. I can't see how you having a long dated 2017 call matters. You would still be long this call once assignment of the short call was settled.