I am using JasperReport\'s iReport 4.5.0 designer to build my report. I am having one problem with the timestamp fields startDate and endDate
You can try to set net.sf.jasperreports.export.xls.detect.cell.type property for correct formatting in case export to Excel format.
This issue is very strange. You can add the variable of java.text.DateFormat type and use it like in this sample:
It is works for me. I have the correct data for both textFields (with using DateFormat and without it) for PDF and XLS.