Please clarify which "Experiment" you are referring to. There are many experiments throughout history and in different fields. To provide you with the correct information, please specify:

* The name of the experiment: For example, "The Stanford Prison Experiment" or "The Milgram Experiment."

* The field of the experiment: For example, psychology, physics, or biology.

Once you provide more details, I can help you find the date when the experiment was created.