晦日

huìrì
  1. (literary) the last day of a month in the lunar calendar
  2. the last day of a month in the lunar calendar

Wiktionary

Entry Composition

1 晦 huì
  1. (bound form) last day of a lunar month
  2. (bound form) dark; gloomy
  3. (literary) night
=2 日 Rì abbr. for 日本 Rìběn, Japan
=2 日 rì
  1. sun
  2. day
  3. date, day of the month