How to insert a date to an Open XML worksheet?

Question

I\'m using Microsoft Open XML SDK 2 and I\'m having a really hard time inserting a date into a cell. I can insert numbers without a problem by setting Cell.DataType = Cell

Answer 1

You have to convert DateTime to double using function ToOADate i.e.:

DateTime dtValue = DateTime.Now;
string strValue = dtValue.ToOADate().ToString(CultureInfo.InvariantCulture);

then set it as CellValue

Cell cell;
cell.DataType = new EnumValue(CellValues.Date);
cell.CellValue = new CellValue(strValue);

Remember to format cell using DateTime formatting, otherwise you will see double value, not date.