31 ga Disamba wata takamaiman rana ce a kalandar Gregorian, wato ranar ƙarshe ta shekara. An fi saninta da jajibirin sabuwar shekara kuma ana yin bikin a sassa da dama na duniya a matsayin daren da ke gaban ranar sabuwar shekara, wanda ya zo a ranar 1 ga Janairu. Sunan "December" ya fito ne daga kalmar Latin "decem," ma'ana goma, kamar yadda yake. asalin wata na goma ne a kalandar Romawa. Duk da haka, lokacin da aka gyara kalanda, ya zama wata na goma sha biyu.