Today I learned that Excel incorrectly assumes 1900 was a leap year, and Microsoft will never fix it because the whole house of cards would collapse
Nestled away amongst a pile of recently updated pages on Microsoft’s Learn site, which contains product documentation and technical resources, was a curiously titled article: “Excel incorrectly assumes that the year 1900 is a leap year.” I thought that can’t be right, surely everything would have fallen over long ago, but it turns out that this problem has long been known about among Excel-fanciers and Microsoft is never going to fix it: because then everything would collapse.