Index: binaries/data/mods/public/gui/common/l10n.js
===================================================================
--- binaries/data/mods/public/gui/common/l10n.js
+++ binaries/data/mods/public/gui/common/l10n.js
@@ -0,0 +1,41 @@
+function durationToString(time)
+{
+	return Engine.FormatMillisecondsIntoDateStringGMT(time, time < 1000 * 60 * 60 ?
+		// Translation: Format of the time elapsed or remaining, for game durations, ceasefire and wonder-victory countdowns, etc.
+		// For a list of symbols that you can use, see:
+		// https://sites.google.com/site/icuprojectuserguide/formatparse/datetime?pli=1#TOC-Date-Field-Symbol-Table
+		// The default format is for the US, but every language/country will probably want to use this format too.
+		translateWithContext("duration less than one hour", "m:ss") :
+		// Translation: Format of the time elapsed or remaining, for game durations, ceasefire and wonder-victory countdowns, etc.
+		// For a list of symbols that you can use, see:
+		// https://sites.google.com/site/icuprojectuserguide/formatparse/datetime?pli=1#TOC-Date-Field-Symbol-Table
+		// The default format is for the US, but every language/country will probably want to use this format too.
+		translateWithContext("duration greater than one hour", "H:mm:ss"));
+}
+
+function timeOfDayToString(time)
+{
+	// Translation: Format of the local time as shown in the chat in the lobby, game setup, and session, and the lobby game start time.
+	// For a list of symbols that you can use, see:
+	// https://sites.google.com/site/icuprojectuserguide/formatparse/datetime?pli=1#TOC-Date-Field-Symbol-Table
+	// The default format is for the US. Most other languages/countries may want to use "HH:mm" instead.
+	return Engine.FormatMillisecondsIntoDateStringLocal(time, translateWithContext("time of day", "h:mm a"));
+}
+
+function datetimeToString(datetime)
+{
+	// Translation: Format of the local datetime as shown in the load game, save game, and replay menus.
+	// For a list of symbols that you can use, see:
+	// https://sites.google.com/site/icuprojectuserguide/formatparse/datetime?pli=1#TOC-Date-Field-Symbol-Table
+	// The default format is for the US. Most other languages/countries may want to use "yyyy-MM-dd HH:mm" instead.
+	return Engine.FormatMillisecondsIntoDateStringLocal(datetime, translateWithContext("datetime", "M/d/yyyy h:mm a"));
+}
+
+function monthToString(datetime)
+{
+	// Translation: Format of the local date (month) as shown in the date filter dropdown in the replay menu.
+	// For a list of symbols that you can use, see:
+	// https://sites.google.com/site/icuprojectuserguide/formatparse/datetime?pli=1#TOC-Date-Field-Symbol-Table
+	// The default format is for the US. Most other languages/countries may want to use "yyyy-MM" instead.
+	return Engine.FormatMillisecondsIntoDateStringLocal(datetime, translateWithContext("date month", "M/yyyy"));
+}