Japanese

Noun

改暦 ‎(hiragana かいれき, romaji kaireki)

1. revision of the calendar (e.g. from lunar to solar)
2. change of calendar at the start of the year

Verb

改暦する ‎(hiragana かいれきする, romaji kaireki suru)

1. revise the calendar
2. change the calendar at the start of the year