remove date from core, app_wasm.html

src/os/os_unix.c

@@ -0,0 +1,12 @@
+fn os_date_t os_date_now(void) {
+    os_date_t result = {0};
+    time_t time = time(NULL);
+    struct tm *lt = localtime(&time);
+    result.sec = lt->tm_sec;
+    result.min = lt->tm_min;
+    result.hour = lt->tm_hour;
+    result.day = lt->tm_mday;
+    result.month = lt->tm_month;
+    result.year = lt->tm_year;
+    return result;
+}