Mantis#1653. Thank you kindly, Vytek for a patch that:

Implements llGetTimeOfDay().

OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs

@@ -1393,8 +1393,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
         public double llGetTimeOfDay()
         {
             m_host.AddScriptLPS(1);
-            NotImplemented("llGetTimeOfDay");
-            return 0;
+            return (double) (((DateTime.Now.TimeOfDay.Milliseconds / 1000) % (3600*4))*World.TimeDilation);
         }
 
         public double llGetWallclock()