Translation guide
The English word "day" can refer to a 24-hour period, daylight hours, a specific date, or an era. Japanese uses different words depending on the meaning.
良い一日を。
Have a nice day!
A common phrase, though slightly formal. In casual speech, you might just say じゃあね (see you).
A day is 24 hours.
三日間休みます。
I will take three days off.
Specifically means 'one day' as a duration. Often used when emphasizing the length of a day.
一日中働きました。
I worked all day.
Referring to the period of daylight, from sunrise to sunset.
Means 'daytime' or 'noon'. Used to contrast with night.
昼は暖かいですが、夜は寒いです。
It's warm during the day, but cold at night.
Refers to the daytime hours, often in more formal or written contexts.
Referring to a particular calendar day, such as a date or a named day.
Used in compound words for days of the week or specific dates. Also used in the pattern '〜の日' (the day of...).
今日は何の日ですか。
What day is it today?
月曜日は忙しいです。
Monday is a busy day.
Means 'anniversary' or 'memorial day'. Used for special days.
Referring to a particular period in history or someone's life, often used in a literary or figurative sense.
Means 'era' or 'period'. Used for historical periods or a phase in life.
学生時代は楽しかった。
My school days were fun.
Means 'days' in the sense of everyday life or a continuous period. Often used in literary contexts.
平和な日々を過ごしています。
I'm spending peaceful days.
Expressing a number of days using Japanese counter words.
The counter for days. The reading changes depending on the number. For example: 一日 (いちにち, one day), 二日 (ふつか, two days), 三日 (みっか, three days).
旅行は三日間です。
The trip is for three days.
Emphasizes the duration of days. Added after the number+日.
五日間雨が降りました。
It rained for five days.
English often uses 'day' in phrases where Japanese uses a different structure. For example, 'these days' is 最近 (さいきん) or この頃 (このごろ), not これらの日々. 'One day' as in 'someday' is いつか, not ある日 (which means 'one day' in a narrative past sense).
日 (ひ) is the general word for 'day' and is used in compounds and counting. 一日 (いちにち) specifically means 'one day' as a duration. For example, 一日中 (いちにちじゅう) means 'all day long'.
次の日、彼は来なかった。
The next day, he didn't come.
一日で終わらせます。
I'll finish it in one day.
数日後に会いましょう。
I'll see you in a few days.
私の若い頃は、違いました。
Back in my day, things were different.
Literally 'When I was young, it was different.' Japanese often uses 若い頃 (わかいころ) instead of a direct translation of 'my day'.
I work during the day.
Today is our wedding anniversary.