How do you say had a long day today in French?

There are a few ways to say "had a long day today" in French, depending on the context and nuance you want to convey:

Formal:

* J'ai eu une longue journée aujourd'hui. (I had a long day today.) This is the most direct and literal translation.

Informal:

* J'ai passé une longue journée. (I spent a long day.) This is more common in informal settings.

* J'ai eu une journée bien chargée. (I had a busy day.) This emphasizes the amount of activity in the day.

* J'en ai bavé aujourd'hui. (I've been through the wringer today.) This is a more colloquial way to say you had a tough day.

If you're feeling tired:

* J'ai la tête dans le guidon. (My head is in the handlebars.) This is a common French expression for feeling exhausted.

* Je suis crevé(e). (I'm dead tired.) This is a very informal way to say you're exhausted.

Choose the phrase that best suits the situation and your level of formality.