Ways to say it
| Japanese | Romanization (Wiktionary) | Note |
|---|---|---|
| 良い日を！ | yoi hi o! | informal |
| 良いー日を！ | yoi ichinichi o! | informal |
良い日を！ is used primarily in casual settings or by service staff toward customers. It is not a standard way to say goodbye in formal Japanese social etiquette. Other ways to express similar well-wishes include 楽しい一日を for a relaxed "Have a fun day" and いい一日をね for a friendlier, warmer "Have a good day, okay?"
What does it mean word for word?
The phrase 良い日を！ is a literal fragment meaning "a good day" followed by the object marker を, which implies an omitted verb such as "have" or "spend".
Is there a formal and an informal way to say it?
The forms 良い日を！ and 良いー日を！ are informal. For more formal or polite situations, you can use 良い一日をお過ごしください to say "Please have a good day" or 素敵な一日をお過ごしください to say "Please have a wonderful day", which is used on special occasions or when speaking to someone deserving of respect.
How do you pronounce it?
yoi hi o!
What mistakes should you avoid?
English speakers often assume 良い日を！ is a standard polite farewell, but using it with a superior or in a formal business setting can sound overly casual or even slightly unnatural.
Did you know?
- While 良い日を！ is now common, it is a modern 'translation' of English greetings. Traditionally, Japanese people rarely wished someone a 'good day' upon parting, preferring phrases that focused on the other person's health or safe return.
- In very formal settings, instead of wishing someone a 'good day', Japanese speakers often use 失礼します which literally means 'I am being rude'. This acknowledges that the act of leaving is an interruption of the other person's time.
- In a business context, wishing a colleague a 'good day' is often replaced by お疲れ様です, which acknowledges their hard work. Focusing on the effort spent is culturally more valued than focusing on the pleasure of the day.
Examples in context
- 良い日を！Yoi hi o!Have a nice day!
- じゃあ、良い日を！Jaa, yoi hi o!Well, have a nice day!
Example conversation
Yota and Himari are parting ways after a quick meeting at a cafe.
- 陽太 Yotaじゃあね、陽葵。Jaa ne, Himari.See you, Himari.
- 陽葵 Himariうん、陽太も。良い日を！Un, Yota mo. Yoi hi o!Yeah, you too, Yota. Have a nice day!
- 陽太 Yotaありがとう。Arigatou.Thank you.
- 陽葵 Himariまたね！Mata ne!Bye!
Sources
- Wiktionary, “have a nice day” translations, CC BY-SA 4.0, dump of 2026-09-26.
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