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9-16-25 was a rare, once-in-a-century date. Did you notice?

Special dates, such as March 14 - 3/14 - (Pi Day), and May 4 (Star Wars Day) generate a lot of excitement every year. For mathematicians, there is also the Square Root Day (4/4/16 or 5/5/25). We just ...
Kansas Public Radio

On 9/16/25, celebrate a date of mathematical beauty

Pi Day (3/14) often comes with sweet treats; Square Root Day (4/4/16 or 5/5/25, for example) has a certain numerical rhyme. But the particular string of numbers in today's date may be especially ...