Month End Close

SUGGESTED

Hello, I recently took over the month end close at my company and have done it for 3 months with no problems. To my understasnding every module in the month needs to be closed before you can proceed to the next month. For the month of December our CPA closed the month since our company was closed from the 12/24/15 to 1/4/16. When we returned we started working in January with no issues. I recently looked at our System Status and it shows the current month is December 2015. How is this possible if we are able to work in every module in January when every module still shows December as the current month? How do I go about closing December 2015 and then now January 2016?