Issue - API Project: Timestamp Microservice

Hi !
A little issue in this challenge i think.
This code doesn’t work for me.

// 400 - Bad request status code 
return res.status(400).send({ error: "Invalid Date" });

It solve with.

// 200 - Ok status code 
return res.status(200).send({ error: "Invalid Date" });

Thanks :crazy_face:

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