Added some date/time basics. (0.19.0)

examples/datetime_basic.fun

@@ -0,0 +1,45 @@
+#!/usr/bin/env fun
+
+/*
+ * This file is part of the Fun programming language.
+ * https://hanez.org/project/fun/
+ *
+ * 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: 2025-10-04
+ */
+
+// Date/time opcode usage examples
+#include <utils/datetime.fun>
+
+fun main()
+  dt = DateTime()
+
+  ms = dt.now_ms()
+  print(join(["now ms: ", to_string(ms)], ""))
+
+  iso = dt.iso_now()
+  print(join(["iso now: ", iso], ""))
+
+  // Formatting an arbitrary timestamp (epoch ms)
+  print(dt.format(ms, "%Y-%m-%d %H:%M:%S %Z"))
+
+  // Measuring elapsed time with monotonic clock
+  start = dt.mono_ms()
+
+  sleep(100)
+  sleep(10)
+  elapsed = dt.mono_ms() - start
+  print(join(["elapsed ~100ms => ", to_string(elapsed), " ms"], ""))
+
+// Invoke main when script is executed directly
+main()
+
+/* Possible output:
+now ms: 1759531591326
+iso now: 2025-10-04T00:46:31
+2025-10-04 00:46:31 CEST
+elapsed ~100ms => 110 ms
+*/