On 4/25/2026 8:55 PM, Derek Atkins wrote: > Which is why 2000 was a leap year. But 1900 was not, and 2100 will > not be! > -derek Easiest way as a mathematical/logical expression Y is a leap year if/f Y mod 400 = 0 or (Y mod 4 = 0 and Y mod 100 not = 0)