diff --git a/src/TimeTableCatalog/XMLReader.cc b/src/TimeTableCatalog/XMLReader.cc
index 2065629..e3b4d88 100644
--- a/src/TimeTableCatalog/XMLReader.cc
+++ b/src/TimeTableCatalog/XMLReader.cc
@@ -29,7 +29,22 @@ void XMLReader::read(TimeTable& pTT) {
 
 	// -- parse xml file and process nodes
 	parse(pTT);
-
+                    // update listStopDate  and listStartDate 
+                   if(pTT._listStopDate <=0 || pTT._listStartDate <=0){
+                        double startDate=std::numeric_limits<double>::max();
+                        double stopDate = -1;
+                        
+                        for (auto intrval : pTT.getIntervals()){
+                            if(intrval._startTime <startDate)
+                                startDate = intrval._startTime;
+                            if(intrval._stopTime > stopDate)
+                                stopDate = intrval._stopTime;
+                          }
+                        if(pTT._listStopDate <=0)
+                            pTT._listStopDate = stopDate;
+                        if(pTT._listStartDate <=0)
+                            pTT._listStartDate = startDate;
+                }
 	// -- cleanup function for the XML library.
 	xmlCleanupParser();
 }
--
libgit2 0.21.2