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We use XlsIO to load Excel files clients upload to our web application. We have come across an issue where the Excel was created with a column that contains dates set as formulas like "=DATE(2019,12,1)". We are able to read the client's file correctly, however, I'm trying to create the same thing manually so we can add a unit test to be sure we don't break support for this. I can't figure out how to get it to work since whenever I set the Formula using XlsIO, the incorrect DisplayText is shown so my unit test fails. Here is a simple example:

using var excel = new ExcelEngine();
var workbook = excel.Excel.Workbooks.Create();
var worksheet = workbook.Worksheets.First();
worksheet[1, 1].Formula = "=DATE(2019,12,1)";
worksheet[1, 1].DisplayText.ShouldBe("12/1/2019");
//ERROR DisplayText is "12/31/1899" instead