How do you translate have a fabulous day in French?

There are a few ways to translate "have a fabulous day" in French, depending on the level of formality and the desired tone:

Formal:

* Passez une excellente journée! (This is the most common and polite way to say it.)

Informal:

* Bonne journée! (This is a very common and friendly way to say it.)

* Passe une super journée! (This is a more informal and casual way to say it.)

* Aie une journée fabuleuse! (This is a literal translation of "have a fabulous day" but it might sound a bit strange to a native French speaker.)

You can also add a little extra to make your wish more personal:

* J'espère que vous aurez une excellente journée! (I hope you have a great day!)

* Profitez bien de votre journée! (Enjoy your day!)

* Amusez-vous bien! (Have fun!)

Ultimately, the best translation depends on the context and your relationship with the person you're speaking to.