PRODUCT: MS Excel 5.0 under Windows ENVIRONMENT: Windows 3.1 with International YMD set. To save typing I tried to load tdate2.wk4. Excel will not load Lotus 5 .wk4 files only .wk3. So I loaded tdate2.wq1, the version from QPRO 4.0 Excel takes its display date from the Windows Setting but its input form is yyyy-mm-dd. All was well, but the calculated date displays were two digits. So I reset them using Format, Cells, Date, yyyy-mm-dd All Ok.
MS Excel 5.0 is Acceptability Index 0, compliant.