diff --git a/build_file.c b/build_file.c
index f31570a..107fcfd 100644
--- a/build_file.c
+++ b/build_file.c
@@ -29,7 +29,7 @@ int main(int argc, char **argv) {
     bool run_server = false;
 
     bool core_test_target = false;
-    bool wasm_target = false;
+    bool wasm_target = true;
     bool win32_target = true;
 
     if (execute_python_snippets) {
diff --git a/src/app/app_wasm.c b/src/app/app_wasm.c
index e8d2604..2592e3e 100644
--- a/src/app/app_wasm.c
+++ b/src/app/app_wasm.c
@@ -45,8 +45,8 @@ glb_wasm_export i32  wasm_temp_buff2_len  = 127;
 global f64                    wasm_dpr;
 global f64                    wasm_delta_time;
 global f64                    wasm_time;
-global f64                    wasm_last_time_milliseconds;
-global f64                    wasm_app_init_time_milliseconds;
+global f64                    wasm_last_time;
+global f64                    wasm_app_init_time;
 global app_event_list_t       wasm_event_list;
 
 typedef struct wasm_cached_t wasm_cached_t;
@@ -178,9 +178,13 @@ fn_wasm_export void wasm_key_up(char *key, b32 ctrl, b32 shift, b32 alt, b32 met
     }
 }
 
+fn f64 wasm_seconds_now(void) {
+    return wasm_get_milliseconds() / 1000.0;
+}
+
 fn_wasm_export void wasm_update(f64 width, f64 height, f64 dpr) {
-    wasm_time = os_milliseconds_now();
-    wasm_delta_time = wasm_time - wasm_last_time_milliseconds;
+    wasm_time = wasm_seconds_now();
+    wasm_delta_time = wasm_time - wasm_last_time;
 
     v2f64_t window_size = (v2f64_t){width / dpr, height / dpr};
     wasm_dpr = dpr;
@@ -205,13 +209,13 @@ fn_wasm_export void wasm_update(f64 width, f64 height, f64 dpr) {
 
     ma_set0(tcx.temp);
     zero_struct(&wasm_event_list);
-    wasm_last_time_milliseconds = wasm_time;
+    wasm_last_time = wasm_time;
 }
 
 fn_wasm_export void wasm_init(void) {
     core_init();
     app_init();
-    wasm_app_init_time_milliseconds = os_milliseconds_now();
+    wasm_app_init_time = wasm_seconds_now();
 }
 
 fn f64 app_get_anim_time(void) {
diff --git a/src/app/app_win32.c b/src/app/app_win32.c
index fda6c9b..0edff4d 100644
--- a/src/app/app_win32.c
+++ b/src/app/app_win32.c
@@ -236,6 +236,20 @@ void w32_try_resizing_canvas(w32_canvas_t *canvas, HWND window_handle) {
     }
 }
 
+fn f64 os_seconds_now(void) {
+    static int64_t counts_per_second;
+    if (counts_per_second == 0) {
+        LARGE_INTEGER freq;
+        QueryPerformanceFrequency(&freq);
+        counts_per_second = freq.QuadPart;
+    }
+
+    LARGE_INTEGER time;
+    QueryPerformanceCounter(&time);
+    f64 result = (f64)time.QuadPart / (f64)counts_per_second;
+    return result;
+}
+
 int WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd) {
     tcx.temp = ma_create(ma_default_reserve_size);
 
diff --git a/src/core/core_platform_unix.c b/src/core/core_platform_unix.c
index 2bdbcc3..3d51c2d 100644
--- a/src/core/core_platform_unix.c
+++ b/src/core/core_platform_unix.c
@@ -32,19 +32,6 @@ fn date_t os_date_now(void) {
     return result;
 }
 
-fn u64 os_get_microseconds(void) {
-    struct timespec t;
-    clock_gettime(CLOCK_MONOTONIC, &t);
-    u64 result = t.tv_sec*million(1) + (t.tv_nsec/thousand(1));
-    return result;
-}
-
-fn f64 os_milliseconds_now(void) {
-    u64 micros = os_get_microseconds();
-    f64 result = (f64)micros / 1000.0;
-    return result;
-}
-
 fn void os_error_box(char *str) {
     fprintf(stderr, "%s", str);
 }
diff --git a/src/core/core_platform_wasm.c b/src/core/core_platform_wasm.c
index 974478c..eaaa7af 100644
--- a/src/core/core_platform_wasm.c
+++ b/src/core/core_platform_wasm.c
@@ -38,10 +38,6 @@ fn f64 os_parse_float(char *str) {
     return wasm_parse_float((isize)str, str_len((char *)str));
 }
 
-fn f64 os_milliseconds_now(void) {
-    return wasm_get_milliseconds();
-}
-
 fn void core_init(void) {
     isize page_size = kib(64);
     isize page_count = __builtin_wasm_memory_size(0);
diff --git a/src/core/core_platform_win32.c b/src/core/core_platform_win32.c
index ddfdaca..b549692 100644
--- a/src/core/core_platform_win32.c
+++ b/src/core/core_platform_win32.c
@@ -32,26 +32,6 @@ fn date_t os_date_now(void) {
     return result;
 }
 
-fn f64 os_seconds_now(void) {
-    static int64_t counts_per_second;
-    if (counts_per_second == 0) {
-        LARGE_INTEGER freq;
-        QueryPerformanceFrequency(&freq);
-        counts_per_second = freq.QuadPart;
-    }
-
-    LARGE_INTEGER time;
-    QueryPerformanceCounter(&time);
-    f64 result = (f64)time.QuadPart / (f64)counts_per_second;
-    return result;
-}
-
-fn f64 os_milliseconds_now(void) {
-    f64 secs = os_seconds_now();
-    f64 result = secs * 1000;
-    return result;
-}
-
 fn void os_error_box(char *str) {
     MessageBoxA(NULL, str, "fatal error", MB_OK);
     fprintf(stderr, "%s", str);
diff --git a/src/os/os.c b/src/os/os.c
new file mode 100644
index 0000000..e69de29
diff --git a/src/os/os.h b/src/os/os.h
new file mode 100644
index 0000000..e69de29
diff --git a/src/os/os_unix.c b/src/os/os_unix.c
new file mode 100644
index 0000000..e69de29
diff --git a/src/os/os_wasm.c b/src/os/os_wasm.c
new file mode 100644
index 0000000..e69de29
diff --git a/src/os/os_win32.c b/src/os/os_win32.c
new file mode 100644
index 0000000..e69de29