diff --git a/code/nel/tools/build_gamedata/sky_dev.bat b/code/nel/tools/build_gamedata/sky_dev.bat
new file mode 100644
index 000000000..ac80d591e
--- /dev/null
+++ b/code/nel/tools/build_gamedata/sky_dev.bat
@@ -0,0 +1,11 @@
+title Ryzom Core: 1_export.py (LEVELDESIGN)
+1_export.py -ipj common/sky common/sfx common/gamedev common/data_common common/data_shard common/leveldesign common/exedll common/cfg shard/data_shard shard/data_language shard/data_leveldesign shard/data_game_share
+title Ryzom Core: 2_build.py (LEVELDESIGN)
+2_build.py -ipj common/sky common/sfx common/gamedev common/data_common common/data_shard common/leveldesign common/exedll common/cfg shard/data_shard shard/data_language shard/data_leveldesign shard/data_game_share
+title Ryzom Core: 3_install.py (LEVELDESIGN)
+3_install.py -ipj common/sky common/sfx common/gamedev common/data_common common/data_shard common/leveldesign common/exedll common/cfg shard/data_shard shard/data_language shard/data_leveldesign shard/data_game_share
+title Ryzom Core: b1_client_dev.py (LEVELDESIGN)
+b1_client_dev.py
+title Ryzom Core: b2_shard_data.py (LEVELDESIGN)
+b2_shard_data.py
+title Ryzom Core: Ready
diff --git a/code/ryzom/client/src/client_sheets/continent_sheet.cpp b/code/ryzom/client/src/client_sheets/continent_sheet.cpp
index 17868866c..6cd46b15c 100644
--- a/code/ryzom/client/src/client_sheets/continent_sheet.cpp
+++ b/code/ryzom/client/src/client_sheets/continent_sheet.cpp
@@ -300,6 +300,9 @@ void CContinentParameters::build(const NLGEORGES::UFormElm &item)
 		if(readSeason<EGSPD::CSeason::Invalid)
 			ForceDisplayedSeason[season]= readSeason;
 	}
+
+	// Read light cycle
+	item.getValueByName(LightCycle, "LightCycle");
 }
 
 
@@ -393,6 +396,8 @@ void CContinentParameters::serial(class NLMISC::IStream &f) throw(NLMISC::EStrea
 		f.serial(SkySheet[i]);
 		f.serialEnum(ForceDisplayedSeason[i]);
 	}
+	//
+	f.serial(LightCycle);
 }
 
 //=========================================================================
diff --git a/code/ryzom/client/src/client_sheets/continent_sheet.h b/code/ryzom/client/src/client_sheets/continent_sheet.h
index 22a73471f..885ec30d4 100644
--- a/code/ryzom/client/src/client_sheets/continent_sheet.h
+++ b/code/ryzom/client/src/client_sheets/continent_sheet.h
@@ -62,9 +62,12 @@ public:
 	/// LandscapeIG filename.
 	std::string		LandscapeIG;
 
-	// New Sky system : gives name of the sky sheet per season. If present, this bypass the SkyDay & SkyNight fields
+	/// New Sky system : gives name of the sky sheet per season. If present, this bypass the SkyDay & SkyNight fields
 	std::string		SkySheet[EGSPD::CSeason::Invalid];
 
+	/// Light Cycle sheet
+	std::string		LightCycle;
+
 	/// SkyDay filename.
 	std::string		SkyDay;
 
diff --git a/code/ryzom/client/src/continent.cpp b/code/ryzom/client/src/continent.cpp
index 4bebe5749..5c9d67f85 100644
--- a/code/ryzom/client/src/continent.cpp
+++ b/code/ryzom/client/src/continent.cpp
@@ -420,6 +420,11 @@ void CContinent::select(const CVectorD &pos, NLMISC::IProgressCallback &progress
 		progress.progress (0);
 		progress.pushCropedValues (0, 1.f/3.f);
 
+		{
+			H_AUTO(InitRZWorldLightCycle)
+			loadWorldLightCycle(CSheetId(LightCycle));
+		}
+
 		{
 			H_AUTO(InitRZWorldIndoor)
 			if (!ClientCfg.Light)
diff --git a/code/ryzom/client/src/continent_manager.cpp b/code/ryzom/client/src/continent_manager.cpp
index 87172ce1a..1ba7c2148 100644
--- a/code/ryzom/client/src/continent_manager.cpp
+++ b/code/ryzom/client/src/continent_manager.cpp
@@ -587,7 +587,7 @@ void CContinentManager::reloadWeather()
 
 	WeatherManager.init();
 	// Load description of light cycles for each season.
-	loadWorldLightCycle();
+	loadWorldLightCycle(CSheetId::Unknown); //FIXME
 	// Load global weather function parameters
 	loadWeatherFunctionParams();
 
diff --git a/code/ryzom/client/src/init_main_loop.cpp b/code/ryzom/client/src/init_main_loop.cpp
index 390b82e15..c462faf85 100644
--- a/code/ryzom/client/src/init_main_loop.cpp
+++ b/code/ryzom/client/src/init_main_loop.cpp
@@ -411,7 +411,7 @@ static void initWeather()
 {
 	WeatherManager.init();
 	// Load description of light cycles for each season.
-	loadWorldLightCycle();
+	loadWorldLightCycle(CSheetId::Unknown); // FIXME
 	// Load global weather function parameters
 	loadWeatherFunctionParams();
 	//
diff --git a/code/ryzom/client/src/interface_v3/action_handler_debug.cpp b/code/ryzom/client/src/interface_v3/action_handler_debug.cpp
index 616d66a1c..ba8dc0100 100644
--- a/code/ryzom/client/src/interface_v3/action_handler_debug.cpp
+++ b/code/ryzom/client/src/interface_v3/action_handler_debug.cpp
@@ -442,7 +442,7 @@ class CAHReloadSeason: public IActionHandler
 	virtual void execute (CCtrlBase * /* pCaller */, const string &/* Params */)
 	{
 		// reload all parameters for weather
-		loadWorldLightCycle();
+		loadWorldLightCycle(CSheetId::Unknown); // FIXME
 		loadWeatherFunctionParams();
 		WeatherManager.init();
 		ContinentMngr.reloadWeather();
diff --git a/code/ryzom/client/src/main_loop_debug.cpp b/code/ryzom/client/src/main_loop_debug.cpp
index 19ea38414..992325c54 100644
--- a/code/ryzom/client/src/main_loop_debug.cpp
+++ b/code/ryzom/client/src/main_loop_debug.cpp
@@ -371,6 +371,9 @@ void displayDebug()
 	// Current GameCycle
 	TextContext->printfAt(1.f, line, "Ms per Cycle : %d", NetMngr.getMsPerTick());
 	line += lineStep;
+	// Smoothed Client Date
+	TextContext->printfAt(1.f, line, "Smoothed Client Date : %u %f", SmoothedClientDate.Day, SmoothedClientDate.Hour);
+	line += lineStep;
 	// Packet Loss
 	TextContext->printfAt(1.f, line, "Packet Loss : %.1f %%", NetMngr.getMeanPacketLoss()*100.0f);
 	line += lineStep;
diff --git a/code/ryzom/client/src/sky.cpp b/code/ryzom/client/src/sky.cpp
index d5a9216ce..855ab3387 100644
--- a/code/ryzom/client/src/sky.cpp
+++ b/code/ryzom/client/src/sky.cpp
@@ -235,7 +235,7 @@ uint CSky::setup(const CClientDate &date, const CClientDate &animationDate, floa
 	// animate objects
 	if (_PlayListManager)
 	{
-		double globalDate = ((double) _NumHourInDay * date.Day + (double) date.Hour) / _NumHourInDay;
+		double globalDate = (double)date.Hour / (double)_NumHourInDay;
 		//nlinfo("global date = %f", (float) globalDate);
 		_PlayListManager->animate(_AnimLengthInSeconds * globalDate);
 	}
diff --git a/code/ryzom/client/src/weather.cpp b/code/ryzom/client/src/weather.cpp
index 91fad6f7c..5969f6008 100644
--- a/code/ryzom/client/src/weather.cpp
+++ b/code/ryzom/client/src/weather.cpp
@@ -87,9 +87,14 @@ void buildLightCycleDesc(CLightCycleDesc &dest,EGSPD::CSeason::TSeason season)
 	else dest.DuskRatio = 0.5f;
 }
 
-void loadWorldLightCycle()
+void loadWorldLightCycle(CSheetId lightCycle)
 {
-	CEntitySheet *sheet = SheetMngr.get(CSheetId("ryzom.light_cycle"));
+	nldebug("Load light cycle '%s'", lightCycle.toString().c_str());
+
+	if (lightCycle == CSheetId::Unknown)
+		lightCycle = CSheetId("ryzom.light_cycle");
+
+	CEntitySheet *sheet = SheetMngr.get(lightCycle);
 	nlassert(sheet);
 	if (sheet->type() != CEntitySheet::LIGHT_CYCLE)
 	{
diff --git a/code/ryzom/client/src/weather.h b/code/ryzom/client/src/weather.h
index 954b7f2c8..02a70a5a2 100644
--- a/code/ryzom/client/src/weather.h
+++ b/code/ryzom/client/src/weather.h
@@ -20,6 +20,7 @@
 #define CL_WORLD_LIGHT_CYCLE_H
 
 
+#include <nel/misc/sheet_id.h>
 #include "game_share/season.h"
 
 struct CLightCycleDesc;
@@ -47,7 +48,7 @@ extern EGSPD::CSeason::TSeason   StartupSeason;
 extern CWeatherFunctionParamsSheet  *WeatherFunctionParams;
 
 // load the world light cycle from a sheet
-void loadWorldLightCycle();
+void loadWorldLightCycle(NLMISC::CSheetId lightCycleSheet);
 
 // load the weather function params
 void loadWeatherFunctionParams();