Hi, Thank you very much for your answer. I made some tests, and it seems to be exactly what I needed. I'll make more advanced tests to see if I can move on with this solution. I just have a problem with it : In JasperSoft Studio, I created a Data Adapter in which I specified that input date format is "dd/MM/yyyy". In my jrxml, I defined a field with type java.util.date. This enables me to modify the date format when I put in on my report. However, with pyreportjasper, the Data Adapter is useless. So I didn't find the way to specify the input date format, and got a "unparseable date" error.... So I modified the type of my date field to java.lang.String. However, it makes the format conversion heavier. Beside this, with the simple report I tested, it works fine. Thanks again for your help.