diff --git a/code/ryzom/client/src/far_tp.cpp b/code/ryzom/client/src/far_tp.cpp
index a7a41c628..ba85862b6 100644
--- a/code/ryzom/client/src/far_tp.cpp
+++ b/code/ryzom/client/src/far_tp.cpp
@@ -1212,10 +1212,10 @@ void CFarTP::sendReady()
 	else
 	{
 		// Set season
-		RT.updateRyzomClock(NetMngr.getCurrentServerTick(), ryzomGetLocalTime() * 0.001);
+		RT.updateRyzomClock(NetMngr.getCurrentServerTick());
 		DayNightCycleHour	= (float)RT.getRyzomTime();
 		CurrSeason = RT.getRyzomSeason();
-		RT.updateRyzomClock(NetMngr.getCurrentServerTick(), ryzomGetLocalTime() * 0.001);
+		RT.updateRyzomClock(NetMngr.getCurrentServerTick());
 		DayNightCycleHour	= (float)RT.getRyzomTime();
 		ManualSeasonValue = RT.getRyzomSeason();
 
diff --git a/code/ryzom/client/src/init_main_loop.cpp b/code/ryzom/client/src/init_main_loop.cpp
index dc9a907b7..15a674c2e 100644
--- a/code/ryzom/client/src/init_main_loop.cpp
+++ b/code/ryzom/client/src/init_main_loop.cpp
@@ -797,10 +797,10 @@ void initMainLoop()
 
 	{
 		// setup good day / season before ig are added.
-		RT.updateRyzomClock(NetMngr.getCurrentServerTick(), ryzomGetLocalTime() * 0.001);
+		RT.updateRyzomClock(NetMngr.getCurrentServerTick());
 		updateDayNightCycleHour();
 		StartupSeason =  CurrSeason = RT.getRyzomSeason();
-		RT.updateRyzomClock(NetMngr.getCurrentServerTick(), ryzomGetLocalTime() * 0.001);
+		RT.updateRyzomClock(NetMngr.getCurrentServerTick());
 		updateDayNightCycleHour();
 		ManualSeasonValue = RT.getRyzomSeason();
 
diff --git a/code/ryzom/client/src/main_loop.cpp b/code/ryzom/client/src/main_loop.cpp
index c0beba4c1..93842ec3f 100644
--- a/code/ryzom/client/src/main_loop.cpp
+++ b/code/ryzom/client/src/main_loop.cpp
@@ -1340,7 +1340,7 @@ bool mainLoop()
 			if (!ClientCfg.Local)
 			{
 				if(NetMngr.getCurrentServerTick() > LastGameCycle)
-					RT.updateRyzomClock(NetMngr.getCurrentServerTick(), ryzomGetLocalTime() * 0.001);
+					RT.updateRyzomClock(NetMngr.getCurrentServerTick());
 			}
 			else if (ClientCfg.SimulateServerTick)
 			{
@@ -1348,7 +1348,7 @@ bool mainLoop()
 				uint numTicks = (uint) floor(SimulatedServerDate * 10);
 				SimulatedServerTick += numTicks;
 				SimulatedServerDate = (float)((double)SimulatedServerDate - (double) numTicks * 0.1);
-				RT.updateRyzomClock((uint32)SimulatedServerTick, ryzomGetLocalTime() * 0.001);
+				RT.updateRyzomClock((uint32)SimulatedServerTick);
 			}
 
 
@@ -2092,14 +2092,14 @@ bool mainLoop()
 						if (Actions.valide ("inc_hour"))
 						{
 							RT.increaseTickOffset( (uint32)(2000 * displayHourDelta) );
-							RT.updateRyzomClock(NetMngr.getCurrentServerTick(), ryzomGetLocalTime() * 0.001);
+							RT.updateRyzomClock(NetMngr.getCurrentServerTick());
 						}
 
 						// Ctrl-L decrease hour
 						if (Actions.valide ("dec_hour"))
 						{
 							RT.decreaseTickOffset( (uint32)(2000 * displayHourDelta) );
-							RT.updateRyzomClock(NetMngr.getCurrentServerTick(), ryzomGetLocalTime() * 0.001);
+							RT.updateRyzomClock(NetMngr.getCurrentServerTick());
 							CTimedFXManager::getInstance().setDate(CClientDate(RT.getRyzomDay(), (float) RT.getRyzomTime()));
 							if (IGCallbacks)
 							{
diff --git a/code/ryzom/common/src/game_share/time_weather_season/time_and_season.cpp b/code/ryzom/common/src/game_share/time_weather_season/time_and_season.cpp
index a24c8a9dd..a71d71be4 100644
--- a/code/ryzom/common/src/game_share/time_weather_season/time_and_season.cpp
+++ b/code/ryzom/common/src/game_share/time_weather_season/time_and_season.cpp
@@ -83,4 +83,19 @@ namespace WEEKDAY
 }; // WEEKDAY
 
 
+void CRyzomTime::updateRyzomClock(uint32 gameCyle)
+{
+	static const uint32 ticksPerDay = (RYZOM_DAY_IN_HOUR * RYZOM_HOURS_IN_TICKS);
+	static const float ticksPerHour = (float)RYZOM_HOURS_IN_TICKS;
 
+	uint32 totalTicks = gameCyle + _TickOffset;
+	uint32 days = totalTicks / ticksPerDay;
+	uint32 dayCycle = totalTicks - (days * ticksPerDay);
+	days -= RYZOM_START_SPRING;
+	float hours = (float)dayCycle / ticksPerHour;
+
+	_RyzomDay = days;
+	_RyzomTime = hours;
+}
+
+/* end of file */
diff --git a/code/ryzom/common/src/game_share/time_weather_season/time_and_season.h b/code/ryzom/common/src/game_share/time_weather_season/time_and_season.h
index 92892fd85..62f144119 100644
--- a/code/ryzom/common/src/game_share/time_weather_season/time_and_season.h
+++ b/code/ryzom/common/src/game_share/time_weather_season/time_and_season.h
@@ -135,18 +135,11 @@ public:
 	{
 		_RyzomDay = 0;
 		_RyzomTime = 0.f;
-		_LocalTime = 0.0;
 		_TickOffset = 0;
 	}
 
 	// Update ryzom clock when tick occurs, local time must be given if localUpdateRyzomClock() and getLocalRyzomTime() is used
-	void updateRyzomClock( uint32 gameCyle, double localTime = 0 )
-	{
-		float hours = ( gameCyle + _TickOffset ) / float(RYZOM_HOURS_IN_TICKS);
-		_RyzomDay = ( (uint)hours / RYZOM_DAY_IN_HOUR ) - RYZOM_START_SPRING;
-		_RyzomTime = (float) fmod( hours, (float)RYZOM_DAY_IN_HOUR );
-		_LocalTime = localTime;
-	}
+	void updateRyzomClock(uint32 gameCyle);
 
 	// get ryzom time (synchronized with server)
 	inline float getRyzomTime() const { return _RyzomTime; }
@@ -202,7 +195,6 @@ private:
 
 	uint32				_RyzomDay;
 	float				_RyzomTime;
-	double				_LocalTime;
 	uint32				_TickOffset;
 };