It's not entirely accurate to say there was a single "creation date" for the theory of relativity. It evolved over time with two major components:

* Special Relativity: This was published in 1905 by Albert Einstein in his paper "On the Electrodynamics of Moving Bodies."

* General Relativity: This was developed by Einstein between 1907 and 1915, culminating in his publication of the "Field Equations" in 1915.

So, depending on which aspect of the theory you're referring to, the "creation" date is either 1905 for special relativity or 1915 for general relativity.