SoftwareOct 31Excel Still Counts February 29, 1900, a Day That Never Happened, Because Lotus 1-2-3 Did, and Microsoft Says Fixing It Would Shift Almost Every Date
RetroOct 31Pardo and Landau's 1970 Patent Let Spreadsheet Formulas Sort Themselves, and Its Owners Sued Lotus 1-2-3 With It
