noun
old lunisolar calendar; traditional Japanese calendar
Refers to the calendar system used in Japan before the adoption of the Gregorian calendar in 1873. Often contrasted with 新暦 (the new/solar calendar).
旧暦の正月は、新暦の二月ごろにあたる。
The New Year on the old calendar falls around February on the new calendar.
この祭りは今でも旧暦
This festival is still held according to the old calendar.