diff --git a/ag.cc b/ag.cc
index af322e9..50af69d 100644
--- a/ag.cc
+++ b/ag.cc
@@ -29,6 +29,7 @@ namespace ag
             { "startFrame", startFrame },
             { "endFrame", endFrame },
             { "setCamera", setCamera },
+            { "elapsedTime", elapsedTime },
             { NULL, NULL }
         };
         luaL_register(L, "ag", functions);
@@ -188,6 +189,12 @@ namespace ag
         return g_engine->setCamera(L);
     }
 
+    int elapsedTime(lua_State * L)
+    {
+        lua_pushinteger(L, SDL_GetTicks());
+        return 1;
+    }
+
     namespace object
     {
         int draw(lua_State * L)
diff --git a/ag.h b/ag.h
index 4776e76..e146cd9 100644
--- a/ag.h
+++ b/ag.h
@@ -16,6 +16,7 @@ namespace ag
     int startFrame(lua_State * L);
     int endFrame(lua_State * L);
     int setCamera(lua_State * L);
+    int elapsedTime(lua_State * L);
 
     namespace object
     {