(svn r25320) -Fix [FS#5577]: link graph start time was not accounted for when cheating dates

src/date.cpp

@@ -18,6 +18,7 @@
 #include "date_func.h"
 #include "vehicle_base.h"
 #include "rail_gui.h"
+#include "linkgraph/linkgraph.h"
 #include "saveload/saveload.h"
 
 Year      _cur_year;   ///< Current year, starting at 0
@@ -211,6 +212,9 @@ static void OnNewYear()
 		_date -= days_this_year;
 		FOR_ALL_VEHICLES(v) v->date_of_last_service -= days_this_year;
 
+		LinkGraph *lg;
+		FOR_ALL_LINK_GRAPHS(lg) lg->ShiftDates(-days_this_year);
+
 #ifdef ENABLE_NETWORK
 		/* Because the _date wraps here, and text-messages expire by game-days, we have to clean out
 		 *  all of them if the date is set back, else those messages will hang for ever */