diff --git a/demo/sdl_opengl2/nuklear_sdl_gl2.h b/demo/sdl_opengl2/nuklear_sdl_gl2.h
index a74ab94..623ef06 100644
--- a/demo/sdl_opengl2/nuklear_sdl_gl2.h
+++ b/demo/sdl_opengl2/nuklear_sdl_gl2.h
@@ -217,6 +217,7 @@ nk_sdl_init(SDL_Window *win)
     sdl.ctx.clip.paste = nk_sdl_clipboard_paste;
     sdl.ctx.clip.userdata = nk_handle_ptr(0);
     nk_buffer_init_default(&sdl.ogl.cmds);
+    sdl.time_of_last_frame = ((float)SDL_GetTicks64()) / 1000;
     return &sdl.ctx;
 }
 
diff --git a/demo/sdl_opengl3/nuklear_sdl_gl3.h b/demo/sdl_opengl3/nuklear_sdl_gl3.h
index a2e9775..b0ee35d 100644
--- a/demo/sdl_opengl3/nuklear_sdl_gl3.h
+++ b/demo/sdl_opengl3/nuklear_sdl_gl3.h
@@ -326,6 +326,7 @@ nk_sdl_init(SDL_Window *win)
     sdl.ctx.clip.paste = nk_sdl_clipboard_paste;
     sdl.ctx.clip.userdata = nk_handle_ptr(0);
     nk_sdl_device_create();
+    sdl.time_of_last_frame = ((float)SDL_GetTicks64()) / 1000;
     return &sdl.ctx;
 }
 
diff --git a/demo/sdl_opengles2/nuklear_sdl_gles2.h b/demo/sdl_opengles2/nuklear_sdl_gles2.h
index 128d263..75acd0d 100644
--- a/demo/sdl_opengles2/nuklear_sdl_gles2.h
+++ b/demo/sdl_opengles2/nuklear_sdl_gles2.h
@@ -326,6 +326,7 @@ nk_sdl_init(SDL_Window *win)
     sdl.ctx.clip.paste = nk_sdl_clipboard_paste;
     sdl.ctx.clip.userdata = nk_handle_ptr(0);
     nk_sdl_device_create();
+    sdl.time_of_last_frame = ((float)SDL_GetTicks64()) / 1000;
     return &sdl.ctx;
 }
 
diff --git a/demo/sfml_opengl2/nuklear_sfml_gl2.h b/demo/sfml_opengl2/nuklear_sfml_gl2.h
index 5677405..8cff5fe 100644
--- a/demo/sfml_opengl2/nuklear_sfml_gl2.h
+++ b/demo/sfml_opengl2/nuklear_sfml_gl2.h
@@ -14,6 +14,7 @@
 #define NK_SFML_GL2_H_
 
 #include <SFML/Window.hpp>
+#include <SFML/System/Clock.hpp>
 
 NK_API struct nk_context*   nk_sfml_init(sf::Window* window);
 NK_API void                 nk_sfml_font_stash_begin(struct nk_font_atlas** atlas);
@@ -51,6 +52,7 @@ static struct nk_sfml {
     struct nk_sfml_device ogl;
     struct nk_context ctx;
     struct nk_font_atlas atlas;
+    sf::Clock* frame_delta_clock;
 } sfml;
 
 NK_INTERN void
@@ -74,6 +76,9 @@ nk_sfml_render(enum nk_anti_aliasing AA)
     int window_width = sfml.window->getSize().x;
     int window_height = sfml.window->getSize().y;
 
+    sfml.ctx.delta_time_seconds = (float)((double)sfml.frame_delta_clock->getElapsedTime().asMicroseconds() / 1000000);
+    sfml.frame_delta_clock->restart();
+
     glPushAttrib(GL_ENABLE_BIT | GL_COLOR_BUFFER_BIT | GL_TRANSFORM_BIT);
     glDisable(GL_CULL_FACE);
     glDisable(GL_DEPTH_TEST);
@@ -229,6 +234,7 @@ nk_sfml_init(sf::Window* window)
     sfml.ctx.clip.paste = nk_sfml_clipboard_paste;
     sfml.ctx.clip.userdata = nk_handle_ptr(0);
     nk_buffer_init_default(&sfml.ogl.cmds);
+    sfml.frame_delta_clock = new sf::Clock();
     return &sfml.ctx;
 }
 
@@ -334,8 +340,8 @@ nk_sfml_handle_event(sf::Event* evt)
     } else if(evt->type == sf::Event::TouchBegan || evt->type == sf::Event::TouchEnded) {
         int down = evt->type == sf::Event::TouchBegan;
         const int x = evt->touch.x, y = evt->touch.y;
-		ctx->input.mouse.pos.x = x;
-		ctx->input.mouse.pos.y = y;
+        ctx->input.mouse.pos.x = x;
+        ctx->input.mouse.pos.y = y;
         nk_input_button(ctx, NK_BUTTON_LEFT, x, y, down);
         return 1;
     } else if(evt->type == sf::Event::TouchMoved) {
@@ -363,6 +369,7 @@ void nk_sfml_shutdown(void)
     nk_free(&sfml.ctx);
     glDeleteTextures(1, &dev->font_tex);
     nk_buffer_free(&dev->cmds);
+    delete sfml.frame_delta_clock;
     memset(&sfml, 0, sizeof(sfml));
 }
 
diff --git a/demo/sfml_opengl3/nuklear_sfml_gl3.h b/demo/sfml_opengl3/nuklear_sfml_gl3.h
index c58bde7..aa46ec5 100644
--- a/demo/sfml_opengl3/nuklear_sfml_gl3.h
+++ b/demo/sfml_opengl3/nuklear_sfml_gl3.h
@@ -66,6 +66,7 @@ static struct nk_sfml {
     struct nk_sfml_device ogl;
     struct nk_context ctx;
     struct nk_font_atlas atlas;
+    sf::Clock* frame_delta_clock;
 } sfml;
 
 #ifdef __APPLE__
@@ -197,11 +198,15 @@ nk_sfml_render(enum nk_anti_aliasing AA, int max_vertex_buffer, int max_element_
     int window_width = sfml.window->getSize().x;
     int window_height = sfml.window->getSize().y;
     GLfloat ortho[4][4] = {
-        {2.0f, 0.0f, 0.0f, 0.0f},
-        {0.0f,-2.0f, 0.0f, 0.0f},
-        {0.0f, 0.0f,-1.0f, 0.0f},
-        {-1.0f,1.0f, 0.0f, 1.0f},
+        {  2.0f,  0.0f,  0.0f, 0.0f },
+        {  0.0f, -2.0f,  0.0f, 0.0f },
+        {  0.0f,  0.0f, -1.0f, 0.0f },
+        { -1.0f,  1.0f,  0.0f, 1.0f },
     };
+
+    sfml.ctx.delta_time_seconds = (float)((double)sfml.frame_delta_clock->getElapsedTime().asMicroseconds() / 1000000);
+    sfml.frame_delta_clock->restart();
+
     ortho[0][0] /= (GLfloat)window_width;
     ortho[1][1] /= (GLfloat)window_height;
 
@@ -336,6 +341,7 @@ nk_sfml_init(sf::Window* window)
     sfml.ctx.clip.paste = nk_sfml_clipboard_paste;
     sfml.ctx.clip.userdata = nk_handle_ptr(0);
     nk_sfml_device_create();
+    sfml.frame_delta_clock = new sf::Clock();
     return &sfml.ctx;
 }
 
@@ -451,10 +457,10 @@ nk_sfml_handle_event(sf::Event* evt)
         } else nk_input_motion(ctx, evt->touch.x, evt->touch.y);
         return 1;
     } else if(evt->type == sf::Event::TextEntered) {
-		/* 8 ~ backspace */
-		if (evt->text.unicode != 8) {
-			nk_input_unicode(ctx, evt->text.unicode);
-		}
+        /* 8 ~ backspace */
+        if (evt->text.unicode != 8) {
+            nk_input_unicode(ctx, evt->text.unicode);
+        }
         return 1;
     } else if(evt->type == sf::Event::MouseWheelScrolled) {
         nk_input_scroll(ctx, nk_vec2(0,evt->mouseWheelScroll.delta));
@@ -469,6 +475,7 @@ void nk_sfml_shutdown()
     nk_font_atlas_clear(&sfml.atlas);
     nk_free(&sfml.ctx);
     nk_sfml_device_destroy();
+    delete sfml.frame_delta_clock;
     memset(&sfml, 0, sizeof(sfml));
 }
 
diff --git a/demo/x11/nuklear_xlib.h b/demo/x11/nuklear_xlib.h
index 28fb4cc..0a80ab4 100644
--- a/demo/x11/nuklear_xlib.h
+++ b/demo/x11/nuklear_xlib.h
@@ -68,10 +68,10 @@ NK_API void                 nk_xfont_del(Display *dpy, XFont *font);
 
 
 #ifndef NK_X11_DOUBLE_CLICK_LO
-#define NK_X11_DOUBLE_CLICK_LO 20
+#define NK_X11_DOUBLE_CLICK_LO 0.02
 #endif
 #ifndef NK_X11_DOUBLE_CLICK_HI
-#define NK_X11_DOUBLE_CLICK_HI 200
+#define NK_X11_DOUBLE_CLICK_HI 0.20
 #endif
 
 typedef struct XSurface XSurface;
@@ -112,15 +112,16 @@ static struct  {
     Cursor cursor;
     Display *dpy;
     Window root;
-    long last_button_click;
+    double last_button_click;
+    double time_of_last_frame;
 } xlib;
 
-NK_INTERN long
-nk_timestamp(void)
+NK_INTERN double
+nk_get_time(void)
 {
     struct timeval tv;
     if (gettimeofday(&tv, NULL) < 0) return 0;
-    return (long)((long)tv.tv_sec * 1000 + (long)tv.tv_usec/1000);
+    return ((double)tv.tv_sec + (double)tv.tv_usec/1000000);
 }
 
 NK_INTERN unsigned long
@@ -662,6 +663,7 @@ nk_xlib_init(XFont *xfont, Display *dpy, int screen, Window root,
 
     xlib.surf = nk_xsurf_create(screen, w, h);
     nk_init_default(&xlib.ctx, font);
+    xlib.time_of_last_frame = nk_get_time();
     return &xlib.ctx;
 }
 
@@ -793,10 +795,10 @@ nk_xlib_handle_event(Display *dpy, int screen, Window win, XEvent *evt)
         const int x = evt->xbutton.x, y = evt->xbutton.y;
         if (evt->xbutton.button == Button1) {
             if (down) { /* Double-Click Button handler */
-                long dt = nk_timestamp() - xlib.last_button_click;
+                float dt = nk_get_time() - xlib.last_button_click;
                 if (dt > NK_X11_DOUBLE_CLICK_LO && dt < NK_X11_DOUBLE_CLICK_HI)
                     nk_input_button(ctx, NK_BUTTON_DOUBLE, x, y, nk_true);
-                xlib.last_button_click = nk_timestamp();
+                xlib.last_button_click = nk_get_time();
             } else nk_input_button(ctx, NK_BUTTON_DOUBLE, x, y, nk_false);
             nk_input_button(ctx, NK_BUTTON_LEFT, x, y, down);
         } else if (evt->xbutton.button == Button2)
@@ -905,6 +907,10 @@ nk_xlib_render(Drawable screen, struct nk_color clear)
     struct nk_context *ctx = &xlib.ctx;
     XSurface *surf = xlib.surf;
 
+    double now = nk_get_time();
+    xlib.ctx.delta_time_seconds = now - xlib.time_of_last_frame;
+    xlib.time_of_last_frame = now;
+
     nk_xsurf_clear(xlib.surf, nk_color_from_byte(&clear.r));
     nk_foreach(cmd, &xlib.ctx)
     {
diff --git a/demo/x11_opengl2/nuklear_xlib_gl2.h b/demo/x11_opengl2/nuklear_xlib_gl2.h
index 2ad2648..d334b92 100644
--- a/demo/x11_opengl2/nuklear_xlib_gl2.h
+++ b/demo/x11_opengl2/nuklear_xlib_gl2.h
@@ -46,10 +46,10 @@ NK_API void                 nk_x11_shutdown(void);
 #include <GL/gl.h>
 
 #ifndef NK_X11_DOUBLE_CLICK_LO
-#define NK_X11_DOUBLE_CLICK_LO 20
+#define NK_X11_DOUBLE_CLICK_LO 0.02
 #endif
 #ifndef NK_X11_DOUBLE_CLICK_HI
-#define NK_X11_DOUBLE_CLICK_HI 200
+#define NK_X11_DOUBLE_CLICK_HI 0.20
 #endif
 
 struct nk_x11_vertex {
@@ -71,15 +71,16 @@ static struct nk_x11 {
     Cursor cursor;
     Display *dpy;
     Window win;
-    long last_button_click;
+    double last_button_click;
+    double time_of_last_frame;
 } x11;
 
-NK_INTERN long
-nk_timestamp(void)
+NK_INTERN double
+nk_get_time(void)
 {
     struct timeval tv;
     if (gettimeofday(&tv, NULL) < 0) return 0;
-    return (long)((long)tv.tv_sec * 1000 + (long)tv.tv_usec/1000);
+    return ((double)tv.tv_sec + (double)tv.tv_usec/1000000);
 }
 
 NK_INTERN void
@@ -102,6 +103,10 @@ nk_x11_render(enum nk_anti_aliasing AA, int max_vertex_buffer, int max_element_b
     int width, height;
     XWindowAttributes attr;
 
+    double now = nk_get_time();
+    x11.ctx.delta_time_seconds = now - x11.time_of_last_frame;
+    x11.time_of_last_frame = now;
+
     NK_UNUSED(max_vertex_buffer);
     NK_UNUSED(max_element_buffer);
 
@@ -311,10 +316,10 @@ nk_x11_handle_event(XEvent *evt)
         const int x = evt->xbutton.x, y = evt->xbutton.y;
         if (evt->xbutton.button == Button1) {
             if (down) { /* Double-Click Button handler */
-                long dt = nk_timestamp() - x11.last_button_click;
+                float dt = nk_get_time() - x11.last_button_click;
                 if (dt > NK_X11_DOUBLE_CLICK_LO && dt < NK_X11_DOUBLE_CLICK_HI)
                     nk_input_button(ctx, NK_BUTTON_DOUBLE, x, y, nk_true);
-                x11.last_button_click = nk_timestamp();
+                x11.last_button_click = nk_get_time();
             } else nk_input_button(ctx, NK_BUTTON_DOUBLE, x, y, nk_false);
             nk_input_button(ctx, NK_BUTTON_LEFT, x, y, down);
         } else if (evt->xbutton.button == Button2)
@@ -363,6 +368,7 @@ nk_x11_init(Display *dpy, Window win)
 
     nk_buffer_init_default(&x11.ogl.cmds);
     nk_init_default(&x11.ctx, 0);
+    x11.time_of_last_frame = nk_get_time();
     return &x11.ctx;
 }
 
diff --git a/demo/x11_opengl3/nuklear_xlib_gl3.h b/demo/x11_opengl3/nuklear_xlib_gl3.h
index c343bb5..a89355b 100644
--- a/demo/x11_opengl3/nuklear_xlib_gl3.h
+++ b/demo/x11_opengl3/nuklear_xlib_gl3.h
@@ -50,10 +50,10 @@ NK_API void                 nk_x11_device_destroy(void);
 #include <GL/glx.h>
 
 #ifndef NK_X11_DOUBLE_CLICK_LO
-#define NK_X11_DOUBLE_CLICK_LO 20
+#define NK_X11_DOUBLE_CLICK_LO 0.02
 #endif
 #ifndef NK_X11_DOUBLE_CLICK_HI
-#define NK_X11_DOUBLE_CLICK_HI 200
+#define NK_X11_DOUBLE_CLICK_HI 0.20
 #endif
 
 #ifdef NK_XLIB_LOAD_OPENGL_EXTENSIONS
@@ -194,7 +194,8 @@ static struct nk_x11 {
     Cursor cursor;
     Display *dpy;
     Window win;
-    long last_button_click;
+    double last_button_click;
+    double time_of_last_frame;
 } x11;
 
 #ifdef __APPLE__
@@ -206,12 +207,12 @@ static struct nk_x11 {
 #ifdef NK_XLIB_LOAD_OPENGL_EXTENSIONS
 #include <GL/glx.h>
 
-NK_INTERN long
-nk_timestamp(void)
+NK_INTERN double
+nk_get_time(void)
 {
     struct timeval tv;
     if (gettimeofday(&tv, NULL) < 0) return 0;
-    return (long)((long)tv.tv_sec * 1000 + (long)tv.tv_usec/1000);
+    return ((double)tv.tv_sec + (double)tv.tv_usec/1000000);
 }
 
 NK_INTERN int
@@ -480,11 +481,15 @@ nk_x11_render(enum nk_anti_aliasing AA, int max_vertex_buffer, int max_element_b
     XWindowAttributes attr;
     struct nk_x11_device *dev = &x11.ogl;
     GLfloat ortho[4][4] = {
-        {2.0f, 0.0f, 0.0f, 0.0f},
-        {0.0f,-2.0f, 0.0f, 0.0f},
-        {0.0f, 0.0f,-1.0f, 0.0f},
-        {-1.0f,1.0f, 0.0f, 1.0f},
+        {  2.0f,  0.0f,  0.0f, 0.0f },
+        {  0.0f, -2.0f,  0.0f, 0.0f },
+        {  0.0f,  0.0f, -1.0f, 0.0f },
+        { -1.0f,  1.0f,  0.0f, 1.0f },
     };
+    double now = nk_get_time();
+    x11.ctx.delta_time_seconds = now - x11.time_of_last_frame;
+    x11.time_of_last_frame = now;
+
     XGetWindowAttributes(x11.dpy, x11.win, &attr);
     width = attr.width;
     height = attr.height;
@@ -678,10 +683,10 @@ nk_x11_handle_event(XEvent *evt)
         const int x = evt->xbutton.x, y = evt->xbutton.y;
         if (evt->xbutton.button == Button1) {
             if (down) { /* Double-Click Button handler */
-                long dt = nk_timestamp() - x11.last_button_click;
+                float dt = nk_get_time() - x11.last_button_click;
                 if (dt > NK_X11_DOUBLE_CLICK_LO && dt < NK_X11_DOUBLE_CLICK_HI)
                     nk_input_button(ctx, NK_BUTTON_DOUBLE, x, y, nk_true);
-                x11.last_button_click = nk_timestamp();
+                x11.last_button_click = nk_get_time();
             } else nk_input_button(ctx, NK_BUTTON_DOUBLE, x, y, nk_false);
             nk_input_button(ctx, NK_BUTTON_LEFT, x, y, down);
         } else if (evt->xbutton.button == Button2)
@@ -730,6 +735,7 @@ nk_x11_init(Display *dpy, Window win)
     XFreePixmap(dpy, blank);}
 
     nk_init_default(&x11.ctx, 0);
+    x11.time_of_last_frame = nk_get_time();
     return &x11.ctx;
 }
 
diff --git a/demo/x11_xft/nuklear_xlib.h b/demo/x11_xft/nuklear_xlib.h
index f0fb074..1931828 100644
--- a/demo/x11_xft/nuklear_xlib.h
+++ b/demo/x11_xft/nuklear_xlib.h
@@ -76,10 +76,10 @@ NK_API void                 nk_xfont_del(Display *dpy, XFont *font);
 
 
 #ifndef NK_X11_DOUBLE_CLICK_LO
-#define NK_X11_DOUBLE_CLICK_LO 20
+#define NK_X11_DOUBLE_CLICK_LO 0.02
 #endif
 #ifndef NK_X11_DOUBLE_CLICK_HI
-#define NK_X11_DOUBLE_CLICK_HI 200
+#define NK_X11_DOUBLE_CLICK_HI 0.20
 #endif
 
 typedef struct XSurface XSurface;
@@ -131,15 +131,16 @@ static struct  {
     Visual *vis;
     Colormap cmap;
 #endif
-    long last_button_click;
+    double last_button_click;
+    double time_of_last_frame;
 } xlib;
 
-NK_INTERN long
-nk_timestamp(void)
+NK_INTERN double
+nk_get_time(void)
 {
     struct timeval tv;
     if (gettimeofday(&tv, NULL) < 0) return 0;
-    return (long)((long)tv.tv_sec * 1000 + (long)tv.tv_usec/1000);
+    return ((double)tv.tv_sec + (double)tv.tv_usec/1000000);
 }
 
 NK_INTERN unsigned long
@@ -182,9 +183,9 @@ nk_xsurf_resize(XSurface *surf, unsigned int w, unsigned int h)
     surf->drawable = XCreatePixmap(surf->dpy, surf->root, w, h,
         (unsigned int)DefaultDepth(surf->dpy, surf->screen));
 #ifdef NK_XLIB_USE_XFT
-	XftDrawChange(surf->ftdraw, surf->drawable);
+    XftDrawChange(surf->ftdraw, surf->drawable);
 #endif
-	return;
+    return;
 }
 
 NK_INTERN void
@@ -198,9 +199,9 @@ nk_xsurf_scissor(XSurface *surf, float x, float y, float w, float h)
     XSetClipRectangles(surf->dpy, surf->gc, 0, 0, &clip_rect, 1, Unsorted);
 
 #ifdef NK_XLIB_USE_XFT
-	XftDrawSetClipRectangles(surf->ftdraw, 0, 0, &clip_rect, 1);
+    XftDrawSetClipRectangles(surf->ftdraw, 0, 0, &clip_rect, 1);
 #endif
-	return;
+    return;
 }
 
 NK_INTERN void
@@ -465,13 +466,13 @@ nk_xsurf_draw_text(XSurface *surf, short x, short y, const char *text, int len,
     xrc.alpha = cfg.a * 257;
     XftColorAllocValue(surf->dpy, xlib.vis, xlib.cmap, &xrc, &color);
     XftDrawStringUtf8(surf->ftdraw, &color, font->ft, tx, ty, (FcChar8*)text, len);
-	XftColorFree(surf->dpy, xlib.vis, xlib.cmap, &color);
+    XftColorFree(surf->dpy, xlib.vis, xlib.cmap, &color);
 #else
     XSetForeground(surf->dpy, surf->gc, fg);
     if(font->set) XmbDrawString(surf->dpy,surf->drawable, font->set, surf->gc, tx, ty, (const char*)text, (int)len);
     else XDrawString(surf->dpy, surf->drawable, surf->gc, tx, ty, (const char*)text, (int)len);
 #endif
-	return;
+    return;
 }
 
 
@@ -610,7 +611,7 @@ NK_INTERN void
 nk_xsurf_del(XSurface *surf)
 {
 #ifdef NK_XLIB_USE_XFT
-	XftDrawDestroy(surf->ftdraw);
+    XftDrawDestroy(surf->ftdraw);
 #endif
     XFreePixmap(surf->dpy, surf->drawable);
     XFreeGC(surf->dpy, surf->gc);
@@ -674,8 +675,8 @@ nk_xfont_get_text_width(nk_handle handle, float height, const char *text, int le
 
     NK_UNUSED(height);
 
-	if(!font || !text)
-		return 0;
+    if(!font || !text)
+        return 0;
 
     XftTextExtentsUtf8(xlib.dpy, font->ft, (FcChar8*)text, len, &g);
     return g.xOff;
@@ -684,8 +685,8 @@ nk_xfont_get_text_width(nk_handle handle, float height, const char *text, int le
 
     NK_UNUSED(height);
 
-	if(!font || !text)
-		return 0;
+    if(!font || !text)
+        return 0;
 
     if(font->set) {
         XmbTextExtents(font->set, (const char*)text, len, NULL, &r);
@@ -702,7 +703,7 @@ nk_xfont_del(Display *dpy, XFont *font)
 {
     if(!font) return;
 #ifdef NK_XLIB_USE_XFT
-	XftFontClose(dpy, font->ft);
+    XftFontClose(dpy, font->ft);
 #else
     if(font->set)
         XFreeFontSet(dpy, font->set);
@@ -747,6 +748,7 @@ nk_xlib_init(XFont *xfont, Display *dpy, int screen, Window root,
     XFreePixmap(dpy, blank);}
     xlib.surf = nk_xsurf_create(screen, w, h);
     nk_init_default(&xlib.ctx, font);
+    xlib.time_of_last_frame = nk_get_time();
     return &xlib.ctx;
 }
 
@@ -878,10 +880,10 @@ nk_xlib_handle_event(Display *dpy, int screen, Window win, XEvent *evt)
         const int x = evt->xbutton.x, y = evt->xbutton.y;
         if (evt->xbutton.button == Button1) {
             if (down) { /* Double-Click Button handler */
-                long dt = nk_timestamp() - xlib.last_button_click;
+                float dt = nk_get_time() - xlib.last_button_click;
                 if (dt > NK_X11_DOUBLE_CLICK_LO && dt < NK_X11_DOUBLE_CLICK_HI)
                     nk_input_button(ctx, NK_BUTTON_DOUBLE, x, y, nk_true);
-                xlib.last_button_click = nk_timestamp();
+                xlib.last_button_click = nk_get_time();
             } else nk_input_button(ctx, NK_BUTTON_DOUBLE, x, y, nk_false);
             nk_input_button(ctx, NK_BUTTON_LEFT, x, y, down);
         } else if (evt->xbutton.button == Button2)
@@ -990,6 +992,10 @@ nk_xlib_render(Drawable screen, struct nk_color clear)
     struct nk_context *ctx = &xlib.ctx;
     XSurface *surf = xlib.surf;
 
+    double now = nk_get_time();
+    xlib.ctx.delta_time_seconds = now - xlib.time_of_last_frame;
+    xlib.time_of_last_frame = now;
+
     nk_xsurf_clear(xlib.surf, nk_color_from_byte(&clear.r));
     nk_foreach(cmd, &xlib.ctx)
     {