December December December is the twelfth and final month of the year in the Julian and Gregorian Calendars and is the seventh and last of seven months to have a length of 31 days. December got its name from the Latin word "decem" (meaning ten) because it was originally the tenth month of the year in the Roman calendar, which began in March. The winter days following December were not included as part of any month. Later, the months of January and February were created out of the monthless period and added to the beginning of the calendar, but December retained
Delivery month futures exchanges (such as bonds, short-term interest rates, foreign exchange and US stock indexes) tend to expire quarterly, in March, June, September and December. For financial contracts traded on non-US futures exchanges, the expiration schedule may not be quarterly. This table lists the conventional letter codes used in tickers to specify delivery month: To name a specific contract in a financial futures market, the month code will follow the contract code, and in turn be followed by the year. For example, CLZ3 is the December 2023 NYMEX crude oil contract. CL denotes crude oil (crude light), Z corresponds to the