diff --git a/libs/app/include/psemek/app/app.hpp b/libs/app/include/psemek/app/app.hpp
index 51de8b43..63995dc4 100644
--- a/libs/app/include/psemek/app/app.hpp
+++ b/libs/app/include/psemek/app/app.hpp
@@ -40,6 +40,8 @@ namespace psemek::app
 
 		void show_cursor(bool show);
 
+		float time() const;
+
 	private:
 		struct impl;
 		std::unique_ptr<impl> pimpl_;
diff --git a/libs/app/source/app.cpp b/libs/app/source/app.cpp
index 8cfccf47..337e3614 100644
--- a/libs/app/source/app.cpp
+++ b/libs/app/source/app.cpp
@@ -31,6 +31,8 @@ namespace psemek::app
 
 	}
 
+	using clock = std::chrono::high_resolution_clock;
+
 	struct app::impl
 	{
 		sdl_initializer init;
@@ -39,6 +41,8 @@ namespace psemek::app
 
 		bool running = false;
 
+		clock::time_point start_time;
+
 		~impl()
 		{
 			if (gl_context) SDL_GL_DeleteContext(gl_context);
@@ -49,6 +53,8 @@ namespace psemek::app
 	app::app(std::string const & name)
 		: pimpl_{std::make_unique<struct impl>()}
 	{
+		impl().start_time = clock::now();
+
 		SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
 		SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, gl::sys::GetLeastMajorVersion());
 		SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, gl::sys::GetLeastMinorVersion());
@@ -206,4 +212,9 @@ namespace psemek::app
 		SDL_ShowCursor(show ? SDL_TRUE : SDL_FALSE);
 	}
 
+	float app::time() const
+	{
+		return std::chrono::duration_cast<std::chrono::duration<float>>(clock::now() - impl().start_time).count();
+	}
+
 }