一日ついたち

つ

い

た

ち

Common wordJLPTN5

Meanings

1

noun

Refers specifically to the first calendar day of a month. Not used for 'one day' duration; that is いちにち.

一日ついたちUsage33%
Standard kanji spelling. Note that this form can also be read いちにち (one day), but context usually disambiguates.
１日ついたちUsage67%
Common in schedules, dates, and practical writing. The numeral form is widely used.
朔ついたちUsage1%
rarely-used kanji form
Very rare single-character form; not recommended for learners.
朔日ついたちUsage<1%
rarely-used kanji form
Rarely used kanji form; mostly seen in formal or traditional contexts.

いちにち
一日 read いちにち means 'one day' (duration) or 'all day'. ついたち is only for the first day of the month.

Derived from 月立ち (つきたち), meaning 'the rising of the month', referring to the first day of the lunar month. The reading shifted to ついたち.