Try changing two properties of jasperserver_config.properties shown below present in WEB-INF/bundles: date.format=yyyy-MM-ddcalendar.date.format=yy-mm-dd Keep in mind that this is a server level change, and you need to make this change only if you need this change to all the dates you have as parameters in all the reports.If you need a change for only one report - i would suggest you to create a new locale and make these changes only to that particular locale. That way, if you are embedding this report in your application, you can call this report with an additional parameter to supply this locale.