一日ついたち

つ

い

た

ち

Meanings

1

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

The first of next month is a Monday.

４月がつ１つい日たちはエイプリルフールです。

April 1st is April Fools' Day.

〈月つき〉〉の一日ついたちthe first day of a given month
四し月がつの一日ついたちに新しん学がっ期きが始はじまる。
The new school term starts on April 1st.
一日ついたちからstarting from the first of the month
来らい月げつの一日ついたちから新あたらしい料りょう金きんが適てき用ようされる。
The new rates will apply starting from the first of next month.

三み十そ日か
一日 (ついたち) is the first day of the month, while 晦日 (みそか) is the last day of the month.

一いち日にちN5
一日 read ついたち means only 'the first day of the month', while the same kanji read いちにち means 'one day' or 'all day' in a duration sense.
二日ふつかN5
一日 refers to the 1st day of the month, while 二日 refers to the 2nd; both use irregular date readings that learners often mix up.

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つい日たち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%

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.

十とお日か

N5

十日 (とおか) and 一日 (ついたち) are both irregular native-Japanese readings used for dates, and beginners often confuse which day each one refers to.

rarely-used kanji form

Rarely used kanji form; mostly seen in formal or traditional contexts.