Index: binaries/data/mods/public/gui/common/datetime.js
===================================================================
--- /dev/null
+++ binaries/data/mods/public/gui/common/datetime.js
@@ -0,0 +1,14 @@
+function durationToString(time)
+{
+	return Engine.FormatMillisecondsIntoDateStringGMT(time, time < 1000 * 60 * 60 ?
+		// Translation: Format of the time elapsed or remaining as shown for example in game durations,
+		// the production queue, and ceasefire and victory countdowns.
+		// For a list of symbols that you can use, see:
+		// http://userguide.icu-project.org/formatparse/datetime#TOC-Date-Field-Symbol-Table
+		translateWithContext("duration less than one hour", "m:ss") :
+		// Translation: Format of the time elapsed or remaining as shown for example in game durations,
+		// the production queue, and ceasefire and victory countdowns.
+		// For a list of symbols that you can use, see:
+		// http://userguide.icu-project.org/formatparse/datetime#TOC-Date-Field-Symbol-Table
+		translateWithContext("duration greater than one hour", "H:mm:ss"));
+}
Index: binaries/data/mods/public/gui/common/functions_utility.js
===================================================================
--- binaries/data/mods/public/gui/common/functions_utility.js
+++ binaries/data/mods/public/gui/common/functions_utility.js
@@ -126,17 +126,6 @@
 	return mapTitle == "random" ? translateWithContext("map selection", "Random") : translate(mapTitle);
 }
 
-/**
- * Convert time in milliseconds to [hh:]mm:ss string representation.
- * @param time Time period in milliseconds (integer)
- * @return String representing time period
- */
-function timeToString(time)
-{
-	return Engine.FormatMillisecondsIntoDateStringGMT(time, time < 1000 * 60 * 60 ?
-		translate("mm:ss") : translate("HH:mm:ss"));
-}
-
 function removeDupes(array)
 {
 	// loop backwards to make splice operations cheaper
Index: binaries/data/mods/public/gui/loadgame/load.js
===================================================================
--- binaries/data/mods/public/gui/loadgame/load.js
+++ binaries/data/mods/public/gui/loadgame/load.js
@@ -109,7 +109,7 @@
 	setMapPreviewImage("savedInfoPreview", mapData.preview);
 
 	Engine.GetGUIObjectByName("savedPlayers").caption = metadata.initAttributes.settings.PlayerData.length - 1;
-	Engine.GetGUIObjectByName("savedPlayedTime").caption = timeToString(metadata.gui.timeElapsed ? metadata.gui.timeElapsed : 0);
+	Engine.GetGUIObjectByName("savedPlayedTime").caption = durationToString(metadata.gui.timeElapsed ? metadata.gui.timeElapsed : 0);
 	Engine.GetGUIObjectByName("savedMapType").caption = translateMapType(metadata.initAttributes.mapType);
 	Engine.GetGUIObjectByName("savedMapSize").caption = translateMapSize(metadata.initAttributes.settings.Size);
 	Engine.GetGUIObjectByName("savedVictory").caption = translateVictoryCondition(metadata.initAttributes.settings.GameType);
Index: binaries/data/mods/public/gui/replaymenu/replay_menu.js
===================================================================
--- binaries/data/mods/public/gui/replaymenu/replay_menu.js
+++ binaries/data/mods/public/gui/replaymenu/replay_menu.js
@@ -330,13 +330,13 @@
 }
 
 /**
- * Returns a human-readable version of the time when the replay started.
+ * Returns a human-readable version of the duration of the replay.
  *
  * @returns {string}
  */
 function getReplayDuration(replay)
 {
-	return timeToString(replay.duration * 1000);
+	return durationToString(replay.duration * 1000);
 }
 
 /**
Index: binaries/data/mods/public/gui/session/menu.js
===================================================================
--- binaries/data/mods/public/gui/session/menu.js
+++ binaries/data/mods/public/gui/session/menu.js
@@ -407,7 +407,7 @@
 	let diplomacyCeasefireCounter = Engine.GetGUIObjectByName("diplomacyCeasefireCounter");
 	diplomacyCeasefireCounter.caption = sprintf(
 		translateWithContext("ceasefire", "Time remaining until ceasefire is over: %(time)s."),
-		{ "time": timeToString(simState.ceasefireTimeRemaining) }
+		{ "time": durationToString(simState.ceasefireTimeRemaining) }
 	);
 	diplomacyCeasefireCounter.hidden = !isCeasefireActive;
 }
Index: binaries/data/mods/public/gui/session/messages.js
===================================================================
--- binaries/data/mods/public/gui/session/messages.js
+++ binaries/data/mods/public/gui/session/messages.js
@@ -592,7 +592,7 @@
 		if (n.translateParameters)
 			translateObjectKeys(parameters, n.translateParameters);
 
-		parameters.time = timeToString(n.endTime - GetSimState().timeElapsed);
+		parameters.time = durationToString(n.endTime - GetSimState().timeElapsed);
 
 		colorizePlayernameParameters(parameters);
 
Index: binaries/data/mods/public/gui/session/selection_panels.js
===================================================================
--- binaries/data/mods/public/gui/session/selection_panels.js
+++ binaries/data/mods/public/gui/session/selection_panels.js
@@ -620,8 +620,7 @@
 
 		// Show the time remaining to finish the first item
 		if (data.i == 0)
-			Engine.GetGUIObjectByName("queueTimeRemaining").caption =
-				Engine.FormatMillisecondsIntoDateStringGMT(queuedItem.timeRemaining, translateWithContext("countdown format", "m:ss"));
+			Engine.GetGUIObjectByName("queueTimeRemaining").caption = durationToString(queuedItem.timeRemaining);
 
 		let guiObject = Engine.GetGUIObjectByName("unitQueueProgressSlider[" + data.i + "]");
 		let size = guiObject.size;
Index: binaries/data/mods/public/gui/session/session.js
===================================================================
--- binaries/data/mods/public/gui/session/session.js
+++ binaries/data/mods/public/gui/session/session.js
@@ -1382,15 +1382,15 @@
 		if (currentSpeed != 1.0)
 			// Translation: The "x" means "times", with the mathematical meaning of multiplication.
 			counters.push(sprintf(translate("%(time)s (%(speed)sx)"), {
-				"time": timeToString(simState.timeElapsed),
+				"time": durationToString(simState.timeElapsed),
 				"speed": Engine.FormatDecimalNumberIntoString(currentSpeed)
 			}));
 		else
-			counters.push(timeToString(simState.timeElapsed));
+			counters.push(durationToString(simState.timeElapsed));
 	}
 
 	if (simState.ceasefireActive && Engine.ConfigDB_GetValue("user", "gui.session.ceasefirecounter") === "true")
-		counters.push(timeToString(simState.ceasefireTimeRemaining));
+		counters.push(durationToString(simState.ceasefireTimeRemaining));
 
 	g_ResearchListTop = 4 + 14 * counters.length;
 }
Index: binaries/data/mods/public/gui/summary/summary.js
===================================================================
--- binaries/data/mods/public/gui/summary/summary.js
+++ binaries/data/mods/public/gui/summary/summary.js
@@ -456,7 +456,7 @@
 
 	Engine.GetGUIObjectByName("timeElapsed").caption = sprintf(
 		translate("Game time elapsed: %(time)s"), {
-			"time": timeToString(g_GameData.sim.timeElapsed)
+			"time": durationToString(g_GameData.sim.timeElapsed)
 	});
 
 	let mapType = g_Settings.MapTypes.find(type => type.Name == g_GameData.sim.mapSettings.mapType);