Ста́рый Но́вый год — Новый год по юлианскому календарю (по старому стилю). Наступает в ночь с 13 на 14 января. Словосочетание

Old New Year is New Year according to the Julian calendar (according to the old style). It comes at night from the 13th to the 14th of January. The phrase is an oxymoron. It is an unofficial holiday of the peoples of the former Soviet Union and other countries where the state changed the chronology. In Russia, the holiday appeared in 1918, in connection with the introduction of the Gregorian calendar in Russia.