diff --git a/test_suite/FGTestApi/testGlobals.cxx b/test_suite/FGTestApi/testGlobals.cxx
index 687886631..5ee07e763 100644
--- a/test_suite/FGTestApi/testGlobals.cxx
+++ b/test_suite/FGTestApi/testGlobals.cxx
@@ -1,6 +1,7 @@
 #include "config.h"
 
 #include "test_suite/dataStore.hxx"
+#include <ctime>
 
 #include "TestDataLogger.hxx"
 #include "testGlobals.hxx"
@@ -67,8 +68,7 @@ void initTestGlobals(const std::string& testName)
 
     fgSetDefaults();
 
-    std::unique_ptr<TimeManager> t;
-    t.reset(new TimeManager);
+    auto t = globals->add_new_subsystem<TimeManager>(SGSubsystemMgr::INIT);
     t->init(); // establish mag-var data
 
     /**
@@ -369,6 +369,15 @@ bool runForTimeWithCheck(double t, RunCheck check)
     return false;
 }
 
+void adjustSimulationWorldTime(time_t desiredUnixTime)
+{
+    int timeOffset = desiredUnixTime - time(nullptr);
+    globals->get_props()->setIntValue("/sim/time/cur-time-override", 0);
+    globals->get_props()->setIntValue("/sim/time/warp", timeOffset);
+
+    globals->get_subsystem<TimeManager>()->update(0.0);
+}
+
 void writeFlightPlanToKML(flightgear::FlightPlanRef fp)
 {
     if (!global_loggingToKML)
diff --git a/test_suite/FGTestApi/testGlobals.hxx b/test_suite/FGTestApi/testGlobals.hxx
index e48ac24e1..9e69dfd42 100644
--- a/test_suite/FGTestApi/testGlobals.hxx
+++ b/test_suite/FGTestApi/testGlobals.hxx
@@ -48,6 +48,11 @@ void setPositionAndStabilise(const SGGeod& g);
     
 void runForTime(double t);
 
+/**
+ @brief set the simulation date/time clock to 'time' 
+ */
+void adjustSimulationWorldTime(time_t time);
+
 using RunCheck = std::function<bool(void)>;
     
 bool runForTimeWithCheck(double t, RunCheck check);