No Difference Between American and British?

Algebra Level 2

A contest is held at the international level in December 2013, and the finale was between an American and a British student. They were asked to state their name and date on the test papers, and there were no other distinguishing features. When the papers were marked, the grader realized that both competitors had the same name and couldn't tell which paper was submitted by which student.

What is the date of competition ?

Image credit: United Bamboo
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