I had the same issue which which converts date format Apr 14, 2023, 09:29:00 PM to Oct 23, 2022, 02:34:00 a when export report to excel with jasper report version 8. I was able to fix it by making following property inside bean id="xlsExportParameters" in applicationContext.xml (WEB-INF/applicationContext.xml) and restart the server. ```<property name="detectCellType" value="false"/>```