diff --git a/internal/Clock.cpp b/internal/Clock.cpp
new file mode 100644
index 0000000..51fc961
--- /dev/null
+++ b/internal/Clock.cpp
@@ -0,0 +1,20 @@
+#include "Clock.hpp"
+
+namespace rnd7 {
+
+////////////////////////////////////////////////////////////
+    Time Clock::getElapsedTime() const {
+        return getCurrentTime() - m_startTime;
+    }
+
+
+////////////////////////////////////////////////////////////
+    Time Clock::restart() {
+        Time now = getCurrentTime();
+        Time elapsed = now - m_startTime;
+        m_startTime = now;
+
+        return elapsed;
+    }
+
+}