There are some critical bugs in converting date-fields and also in some number-fields.
As you can see in the pictures, I used your latest Aspose.Cells.net Version (18.8) in Visual Studio 2015 Professional (Version 14.0.25431.01 Update 3).
The affected area is highlighted.
123.jpg (382.2 KB)
124.png (74.1 KB)
I could send you the origin file as well as the converted file for further analyses. …just send me a short message and I will do that.
This is the code I´m using for the conversion:
Private Sub xlsconvertaspose(filewithsource As String)
Dim workbook As Workbook = New Workbook(filewithsource)
Dim sheet As Worksheet = workbook.Worksheets.Item(0)