diff --git a/code/ryzom/client/data/gamedev/interfaces_v3/compass.xml b/code/ryzom/client/data/gamedev/interfaces_v3/compass.xml
index c2bd7a407..003c90f00 100644
--- a/code/ryzom/client/data/gamedev/interfaces_v3/compass.xml
+++ b/code/ryzom/client/data/gamedev/interfaces_v3/compass.xml
@@ -567,7 +567,7 @@
     <!-- compass clock -->
     <group id="clock"
            posref="TL TL"
-           w="50"
+           w="70"
            h="16"
            x="4"
            y="-4">
diff --git a/code/ryzom/client/data/gamedev/interfaces_v3/config.xml b/code/ryzom/client/data/gamedev/interfaces_v3/config.xml
index 50ccf385a..6377953a6 100644
--- a/code/ryzom/client/data/gamedev/interfaces_v3/config.xml
+++ b/code/ryzom/client/data/gamedev/interfaces_v3/config.xml
@@ -2765,6 +2765,9 @@ This MUST follow the Enum MISSION_DESC::TIconId
   <variable entry="UI:SAVE:SHOW_CLOCK"
             type="bool"
             value="false" />
+  <variable entry="UI:SAVE:SHOW_CLOCK_12H"
+            type="bool"
+            value="false" />
   <variable entry="UI:SAVE:SHOW_RETICLE"
             type="bool"
             value="true" />
diff --git a/code/ryzom/client/data/gamedev/interfaces_v3/game_config.xml b/code/ryzom/client/data/gamedev/interfaces_v3/game_config.xml
index bd0952277..ca68212cf 100644
--- a/code/ryzom/client/data/gamedev/interfaces_v3/game_config.xml
+++ b/code/ryzom/client/data/gamedev/interfaces_v3/game_config.xml
@@ -1399,12 +1399,20 @@
                   posparent="cao"
                   x="0"
                   y="-12" />
+        <instance template="tgcw_checkbox"
+                  id="show_clock_12h"
+                  text="uiShowClock12h"
+                  tooltip="uittShowClock12h"
+                  posref="BL TL"
+                  posparent="show_clock"
+                  x="0"
+                  y="-12" />
         <instance template="tgcw_checkbox"
                   id="show_reticle"
                   text="uiShowReticle"
                   tooltip="uittShowReticle"
                   posref="BL TL"
-                  posparent="show_clock"
+                  posparent="show_clock_12h"
                   x="0"
                   y="-12" />
       </group>
@@ -3255,6 +3263,11 @@
                widget="boolbut"
                link="UI:SAVE:SHOW_CLOCK"
                realtime="true" />
+        <param ui="hud:show_clock_12h:c"
+               type="db"
+               widget="boolbut"
+               link="UI:SAVE:SHOW_CLOCK_12H"
+               realtime="true" />
         <param ui="hud:show_reticle:c"
                type="db"
                widget="boolbut"
diff --git a/code/ryzom/client/src/interface_v3/chat_text_manager.cpp b/code/ryzom/client/src/interface_v3/chat_text_manager.cpp
index 83ef7474e..0496f547e 100644
--- a/code/ryzom/client/src/interface_v3/chat_text_manager.cpp
+++ b/code/ryzom/client/src/interface_v3/chat_text_manager.cpp
@@ -167,7 +167,11 @@ CViewBase *CChatTextManager::createMsgText(const ucstring &cstMsg, NLMISC::CRGBA
 	ucstring cur_time;
 	if (showTimestamps())
 	{
-		cur_time = CInterfaceManager::getTimestampHuman();
+		CCDBNodeLeaf *node = NLGUI::CDBManager::getInstance()->getDbProp("UI:SAVE:SHOW_CLOCK_12H", false);
+		if (node && node->getValueBool())
+			cur_time = CInterfaceManager::getTimestampHuman("[%I:%M:%S %p] ");
+		else
+			cur_time = CInterfaceManager::getTimestampHuman();
 	}
 
 	// if text contain any color code, set the text formated and white,
diff --git a/code/ryzom/client/src/interface_v3/interface_manager.cpp b/code/ryzom/client/src/interface_v3/interface_manager.cpp
index fbaac2c86..2624aef77 100644
--- a/code/ryzom/client/src/interface_v3/interface_manager.cpp
+++ b/code/ryzom/client/src/interface_v3/interface_manager.cpp
@@ -1495,7 +1495,10 @@ void CInterfaceManager::updateFrameEvents()
 			{
 				if (pVT->getActive())
 				{
-					str = getTimestampHuman("%H:%M");
+					if (use12hClock())
+						str = getTimestampHuman("%I:%M %p");
+					else
+						str = getTimestampHuman("%H:%M");
 					pVT->setText(str);
 				}
 			}
@@ -3639,6 +3642,14 @@ void CInterfaceManager::CServerToLocalAutoCopy::onLocalChange(ICDBNode *localNod
 	}
 }
 
+// ------------------------------------------------------------------------------------------------
+bool CInterfaceManager::use12hClock()
+{
+	CCDBNodeLeaf *node = NLGUI::CDBManager::getInstance()->getDbProp("UI:SAVE:SHOW_CLOCK_12H", false);
+
+	return (node && node->getValueBool());
+}
+
 // ------------------------------------------------------------------------------------------------
 char* CInterfaceManager::getTimestampHuman(const char* format /* "[%H:%M:%S] " */)
 {
diff --git a/code/ryzom/client/src/interface_v3/interface_manager.h b/code/ryzom/client/src/interface_v3/interface_manager.h
index d0dccecc5..6025868e5 100644
--- a/code/ryzom/client/src/interface_v3/interface_manager.h
+++ b/code/ryzom/client/src/interface_v3/interface_manager.h
@@ -408,6 +408,10 @@ public:
 	void	notifyMailAvailable();
 	void	notifyForumUpdated();
 
+	/** Return true if 12-hour clock should be used
+	 */
+	static bool use12hClock();
+
 	/** Returns a human readable timestamp with the given format.
 	 */
 	static char* getTimestampHuman(const char* format = "[%H:%M:%S] ");