takes genitive case の

  1. daily, everyday.

noun

  1. days (e.g. of one's youth).

adverb

  1. every day, day after day, day by day, from day to day.

Variations

Pronunciation Kanji Kana Is Common
日々 ひび
日々 にちにち
日日 ひび
日日 にちにち

Contained Kanji Breakdown

day, sun, Japan
ひ にっ ニチ (1st, N5)
repeated kanji symbol