--- a/sim/include/sim.h	Thu Feb 14 17:54:13 2013 +0100
+++ a/sim/include/sim.h	Tue Mar 05 14:16:09 2013 +0100
@@ -30,4 +30,6 @@ 
 
 void sim_poll_event (int flag, void *context);
 
+__u64 sim_starttime (void);
+
 #endif /* SIM_H */
--- a/sim/sim.c	Thu Feb 14 17:54:13 2013 +0100
+++ a/sim/sim.c	Tue Mar 05 14:16:09 2013 +0100
@@ -211,6 +211,18 @@ 
 {
   return g_imported.current_ns (g_kernel);
 }
+__u64 sim_starttime (void)
+{
+  static char inited = 0;
+  static __u64 value = 0;
+
+  if (!inited)
+    {
+      value = g_imported.current_ns (0);
+      inited = 1;
+    }
+  return value;
+}
 struct SimTaskTrampolineContext
 {
   void (*callback) (void *);
--- a/sim/time.c	Thu Feb 14 17:54:13 2013 +0100
+++ a/sim/time.c	Tue Mar 05 14:16:09 2013 +0100
@@ -57,7 +57,7 @@ 
 ktime_t ktime_get(void)
 {
   u64 ns = sim_current_ns ();
-  return ns_to_ktime (ns);
+  return ns_to_ktime (ns + sim_starttime ());
 }
 void ktime_get_ts(struct timespec *ts)
 {