For FI_XBTUSD and FI_ETHUSD contracts:

16:00 London time

Month: The last Friday of the calendar month where no contract exists in the following calendar month.

Quarter: The last Friday of the calendar month where a contract exists in the following calendar month.

Semiannual: The last Friday of the calendar month where a Month contract and Quarter contract exists.

For FI_XBTUSD and FI_ETHUSD, the fixed maturity listing schedule results in there always being listed simultaneously three contracts: a Month contract, a Quarter contract, and a Semiannual** contract.

No contract can have the same remaining days to maturity as another currently-listed contract, therefore at maturity, if the days remaining to maturity on one contract correspond to the maturity of a contract with fewer days to maturity, it will roll into that maturity and the new contract with more days to maturity will be listed.

For example, if the monthly contract expires on the 31st of May, then the June quarterly contract will become the June monthly contract, the September semiannual** contract will become the September quarterly contract, and the new semiannual** contract for December will be listed.

For all other inverse contracts:

16:00 London time

Month: The last Friday of the calendar month where no contract exists in the following calendar month.

Quarter: The last Friday of the calendar month where a contract exists in the following calendar month.

The fixed maturity listing schedule results in there always being listed simultaneously two contracts: a Month contract and a Quarter contract.

No contract can have the same remaining days to maturity as another currently-listed contract, therefore at maturity, if the days remaining to maturity on one contract correspond to the maturity of a contract with fewer days to maturity, it will roll into that maturity and the new contract with more days to maturity will be listed.

For example, if the monthly contract expires on the 31st of May, then the June quarterly contract will become the June monthly contract, and the new September quarterly contract will be listed.

For linear contracts on altcoins with less liquidity the listing schedule varies.