diff --git a/Source/CTest/cmCTestRunTest.cxx b/Source/CTest/cmCTestRunTest.cxx
index de8651c96f..40db404a70 100644
--- a/Source/CTest/cmCTestRunTest.cxx
+++ b/Source/CTest/cmCTestRunTest.cxx
@@ -365,6 +365,9 @@ cmCTestRunTest::EndTestResult cmCTestRunTest::EndTest(size_t completed,
     if (!skipped) {
       this->TestResult.CompletionStatus = "Completed";
     }
+    this->TestResult.StartTestTime =
+      std::chrono::duration_cast<std::chrono::milliseconds>(
+        this->TestProcess->GetSystemStartTime().time_since_epoch());
     this->TestResult.ExecutionTime = this->TestProcess->GetTotalTime();
     this->MemCheckPostProcess();
     this->ComputeWeightedCost();
diff --git a/Source/CTest/cmCTestTestHandler.cxx b/Source/CTest/cmCTestTestHandler.cxx
index d8b90e3203..5f442cb96f 100644
--- a/Source/CTest/cmCTestTestHandler.cxx
+++ b/Source/CTest/cmCTestTestHandler.cxx
@@ -1525,6 +1525,7 @@ void cmCTestTestHandler::WriteTestResultHeader(cmXMLWriter& xml,
   xml.Element("Path", this->CTest->GetShortPathToFile(result.Path));
   xml.Element("FullName", this->CTest->GetShortPathToFile(testPath));
   xml.Element("FullCommandLine", result.FullCommandLine);
+  xml.Element("StartTestTime", result.StartTestTime);
 }
 
 void cmCTestTestHandler::WriteTestResultFooter(cmXMLWriter& xml,
diff --git a/Source/CTest/cmCTestTestHandler.h b/Source/CTest/cmCTestTestHandler.h
index e57bc107e8..f2c8e79757 100644
--- a/Source/CTest/cmCTestTestHandler.h
+++ b/Source/CTest/cmCTestTestHandler.h
@@ -194,6 +194,7 @@ public:
     std::string TestMeasurementsOutput;
     std::string InstrumentationFile;
     int TestCount = 0;
+    std::chrono::milliseconds StartTestTime;
     cmCTestTestProperties* Properties = nullptr;
   };
 
diff --git a/Source/cmXMLWriter.h b/Source/cmXMLWriter.h
index e15542d401..bad1bc1301 100644
--- a/Source/cmXMLWriter.h
+++ b/Source/cmXMLWriter.h
@@ -113,6 +113,11 @@ private:
     return std::chrono::system_clock::to_time_t(value);
   }
 
+  static long long SafeContent(std::chrono::milliseconds value)
+  {
+    return value.count();
+  }
+
   template <typename T>
   static T SafeContent(T value)
   {