Bonne journée !

Literally, it means good day, but in natural English it is usually used like Have a nice day!

French often leaves out words that English would include. So instead of a full sentence like I wish you a good day, French commonly just says Bonne journée !

Because journée is a feminine noun.

In French, adjectives usually agree with the noun they describe:

• bon = masculine singular
• bonne = feminine singular

So:

• un bon jour would be masculine
• une bonne journée is feminine

Since the phrase uses journée, you need bonne.

In this kind of fixed expression, French usually leaves out the article.

So when making a wish, French commonly says:

• Bonne journée !
• Bonne soirée !
• Bon week-end !
• Bonne chance !

It is similar to how English says Good luck! rather than A good luck!

They are used at different moments.

• Bonjour = hello / good day as a greeting
• Bonne journée = have a nice day as a parting expression

So:

• when you meet someone: Bonjour !
• when you leave them during the day: Bonne journée !

That is one of the most important differences for learners.

It is typically used when saying goodbye during the daytime, especially:

• in shops
• at the end of a conversation
• at work
• in polite everyday interactions

For example, after buying something, the cashier might say Bonne journée !

It sounds natural, polite, and very common.

Not exactly.

Both relate to day, but they are used differently:

• jour often refers to a day as a calendar unit
• journée often refers to the day as a span of lived time

That is why Bonne journée ! uses journée: it is wishing someone a pleasant stretch of daytime experience, not just naming the date or day.

A simple pronunciation guide is:

bawn zhoor-nay

More closely:

• bonne sounds like bonn
• journée sounds roughly like zhoor-nay

A few key points:

• the j in journée is like the s in measure
• the final -ée sounds like ay
• the French r is not like a strong English r

If you want the IPA, it is: /bɔn ʒuʁne/

Yes. The phrase stays the same:

Bonne journée !

French does not change it just because you are speaking to several people.

If you want to make the group explicit, you can say things like:

• Bonne journée à tous ! = Have a nice day, everyone!
• Bonne journée à vous ! = Have a nice day!

But the basic phrase by itself works perfectly well.

It is neutral and polite, so it works in both formal and informal situations.

You can say it:

• to a friend
• to a coworker
• to a customer
• to a stranger
• to a teacher

If you want to sound a little warmer or more personal, you can add something:

• Bonne journée à toi ! = informal
• Bonne journée à vous ! = polite/formal

Yes. In French, it is completely normal as a standalone expression.

It is an example of an elliptical expression, where some words are understood rather than spoken. The full idea is something like:

• Je vous souhaite une bonne journée = I wish you a good day

But in normal speech, French simply says:

• Bonne journée !

A few very useful related expressions are:

• Bonne matinée ! = Have a nice morning
• Bon après-midi ! = Have a nice afternoon
• Bonne soirée ! = Have a nice evening
• Bonne nuit ! = Good night
• Bon week-end ! = Have a nice weekend

These follow the same general pattern: bon/bonne + time expression.

No. You can write:

• Bonne journée
• Bonne journée !

Both are correct.

The exclamation mark just makes it feel a little more expressive or friendly. In everyday messages, emails, and casual writing, both versions are common.