Here's why:
* "Quell" is not a French word. It's likely you're thinking of "Quel," which means "what" or "which."
* "Is" is the English word "is". The French equivalent is "est".
* "Le jour" means "the day" and is correct.
To make a correct phrase in French, you need to use the correct words and grammar. Here are some possible correct sentences:
* Quel est le jour? (What is the day?)
* C'est quel jour? (Which day is it?)
* Quel jour est-ce? (What day is it?)
Let me know if you have any other French phrases you'd like to check!