formidable form: convert every single entry in a default xml file

We have a regular formidable form and we want to convert every single entry in a xml file. The xml file is already filled with fields and we would like to put the data from formidable form to this xml file. Some field has the data in english format (mm/dd/year) while we want in xml the format dd/mm/year. Some other field has a regular name in the front in the form but we would like that the choice will be transformed in a code (for example if in the form we select Rome we would like that in the xml there will be h501 that is associated to Rome)