Added some more datetime stdlib Fun with examples. And some permission fixes. (0.36.1)

examples/datetime_timer.fun

@@ -0,0 +1,31 @@
+#!/usr/bin/env fun
+
+/*
+ * This file is part of the Fun programming language.
+ * https://fun-lang.xyz/
+ *
+ * Copyright 2025 Johannes Findeisen <you@hanez.org>
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
+ *
+ * Added: 2025-12-09
+ */
+
+// Simple stopwatch using DateTime helpers
+#include <utils/datetime.fun>
+
+fun main()
+  dt = DateTime()
+  print("Starting timer for ~250ms ...")
+  t0 = dt.start_timer()
+  dt.sleep_s(0.2) // 200 ms
+  dt.sleep_ms(50)
+  elapsed = dt.elapsed_ms(t0)
+  print(join(["Elapsed: ", to_string(elapsed), " ms"], ""))
+
+main()
+
+/* Possible output:
+Starting timer for ~250ms ...
+Elapsed: 250 ms
+*/