org.ametys.runtime.util.parameter.ParameterHelper#valueToString(Object) does not work for Date older than the first day of 1900 (included). The problem reside in the construction of a new org.joda.time.DateTime from a existing java.util.Date.
A patch is added to the issue, with two news test cases in org.ametys.runtime.test.util.DateConversionTestCase