Saturday, September 27, 2025, is a very special day–mathematically speaking. If you write out September 27, 2025 as 09/27/2025 and eliminate the forward slashes, you get 9,272,025. In other words, 3,045 times 3,045 is 9,272,025, as Fresno State University math instructor Howie Hua explains in a social media video, describing it as the “coolest mathematical date of our lifetime.”But wait, there’s more! According to Timeanddate, this means September 27, 2025 isn’t just a square date, it’s a global square date, which occurs only eight times this century. It’s the square of 45 (45 x 45 = 2025), the square of the sum of all the decimal system digits (0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 45, 45^2 = 2025), and the resulting number when you add up the cubes of those same digits (0^3 + 1^3 + 2^3 +3^3 + 4^3 + 5^3 + 6^3 + 7^3 + 8^3 + 9^3 = 2025).