十五日(じゅうごにち)

じゅうごにち
noun
the 15th (day of the month); fifteen days
1. the 15th of the month; fifteen days
Either the 15th day of a calendar month or a duration of fifteen days. Context determines which meaning applies.
今日(きょう)は五月(ごがつ)十五日(じゅうごにち)だ。
Today is May 15th.
締(し)め切(き)りは来月(らいげつ)の十五日(じゅうごにち)です。
The deadline is the 15th of next month.
出張(しゅっちょう)は十五日(じゅうごにち)間(かん)続(つづ)く予定(よてい)だ。
The business trip is scheduled to last fifteen days.

Follows the standard pattern for dates: number + 日(にち) (or special readings for 1st–10th, 14th, 20th, 24th).

DISAMBIGUATION:

  • For 'the 15th day of the month': used alone or with the month name (五月(ごがつ)十五日(じゅうごにち)).
  • For 'fifteen days' (duration): typically add 間(かん) → 十五日間(じゅうごにちかん).

CULTURAL NOTE: The 15th of the month historically marked the full moon in the lunar calendar; 十五夜(じゅうごや) (lit. 'night of the 15th') refers to the harvest moon festival.

RELATED:

  • 十四日(じゅうよっか): the 14th — note the irregular reading よっか
  • 十六日(じゅうろくにち): the 16th
  • 半月(はんつき): half a month — roughly equivalent in duration
general
Added 2026.5.15 13:12
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