How do you say Once Upon a Time in French?

There are a few ways to say "Once Upon a Time" in French, depending on the context:

Formal:

* Il était une fois... (This is the most common and literal translation)

Informal:

* Il était un temps... (This is slightly less formal)

* Autrefois... (This means "formerly" or "in former times")

For storybooks:

* C'était une fois... (This is similar to "Once upon a time" but often used in storybooks)

You can choose the translation that best suits your needs.