ōmisoka

or is a Japanese traditional celebration on the last day of the year. Traditionally, it was held on the final day of the 12th lunar month. With Japan's switch to using the Gregorian calendar at the beginning of the Meiji era, it is now used on New Year's Eve to celebrate the new year.

==Origins== ===Etymology=== The last day of each month of the Japanese lunisolar calendar was historically named . Originally, "miso" was written as 三十, indicating the 30th day, though misoka sometimes fell on the 29th due to the varying lengths of the lunar month. The last day in the 12th lunar month is called —with the 大 indicating it is the final last day of the month for that year—or the "great thirtieth day". As part of the Meiji Restoration, Japan switched to the Gregorian calendar in 1873, and ōmisoka was set as December 31, or New Year's Eve. The day is also known by the archaic pronunciation of . This is a shortened version of , meaning "last day of the month".