Is Today Prime?

Is Today Prime? asks whether today’s date, written as a number, comes out prime. It tries every ordering — ISO, American, and European — in both long and short years, then rolls them up into a transatlantic verdict and an international one. Verdicts are timezone-aware, so a prime day in Tokyo isn’t a prime day in Los Angeles. The answer is almost always a giant “Nope.”

JavaScript, React, Node