diff --git a/src/Calendar.js b/src/Calendar.js
index a875653..2a544bb 100644
--- a/src/Calendar.js
+++ b/src/Calendar.js
@@ -64,26 +64,34 @@ function Calendar(element, instanceOptions) {
 	// -----------------------------------------------------------------------------------
 	// Apply overrides to the current language's data
 
-	var langData = createObject( // make a cheap clone
-		moment.langData(options.lang)
-	);
+
+	// Returns moment's internal locale data. If doesn't exist, returns English.
+	// Works with moment-pre-2.8
+	function getLocaleData(langCode) {
+		var f = moment.localeData || moment.langData;
+		return f.call(moment, langCode) ||
+			f.call(moment, 'en'); // the newer localData could return null, so fall back to en
+	}
+
+
+	var localeData = createObject(getLocaleData(options.lang)); // make a cheap copy
 
 	if (options.monthNames) {
-		langData._months = options.monthNames;
+		localeData._months = options.monthNames;
 	}
 	if (options.monthNamesShort) {
-		langData._monthsShort = options.monthNamesShort;
+		localeData._monthsShort = options.monthNamesShort;
 	}
 	if (options.dayNames) {
-		langData._weekdays = options.dayNames;
+		localeData._weekdays = options.dayNames;
 	}
 	if (options.dayNamesShort) {
-		langData._weekdaysShort = options.dayNamesShort;
+		localeData._weekdaysShort = options.dayNamesShort;
 	}
 	if (options.firstDay != null) {
-		var _week = createObject(langData._week); // _week: { dow: # }
+		var _week = createObject(localeData._week); // _week: { dow: # }
 		_week.dow = options.firstDay;
-		langData._week = _week;
+		localeData._week = _week;
 	}
 
 
@@ -116,7 +124,12 @@ function Calendar(element, instanceOptions) {
 			mom = fc.moment.parseZone.apply(null, arguments); // let the input decide the zone
 		}
 
-		mom._lang = langData;
+		if ('_locale' in mom) { // moment 2.8 and above
+			mom._locale = localeData;
+		}
+		else { // pre-moment-2.8
+			mom._lang = localeData;
+		}
 
 		return mom;
 	};
@@ -204,7 +217,7 @@ function Calendar(element, instanceOptions) {
 
 		// a function that returns a formatStr // TODO: in future, precompute this
 		if (typeof formatStr === 'function') {
-			formatStr = formatStr.call(t, options, langData);
+			formatStr = formatStr.call(t, options, localeData);
 		}
 
 		return formatRange(m1, m2, formatStr, null, options.isRTL);
@@ -216,7 +229,7 @@ function Calendar(element, instanceOptions) {
 
 		// a function that returns a formatStr // TODO: in future, precompute this
 		if (typeof formatStr === 'function') {
-			formatStr = formatStr.call(t, options, langData);
+			formatStr = formatStr.call(t, options, localeData);
 		}
 
 		return formatDate(mom, formatStr);
diff --git a/src/date-formatting.js b/src/date-formatting.js
index ddf3e26..3c87c36 100644
--- a/src/date-formatting.js
+++ b/src/date-formatting.js
@@ -72,12 +72,15 @@ function formatDateWithChunk(date, chunk) {
 // If the dates are the same as far as the format string is concerned, just return a single
 // rendering of one date, without any separator.
 function formatRange(date1, date2, formatStr, separator, isRTL) {
+	var localeData;
 
 	date1 = fc.moment.parseZone(date1);
 	date2 = fc.moment.parseZone(date2);
 
+	localeData = (date1.localeData || date1.lang).call(date1); // works with moment-pre-2.8
+
 	// Expand localized format strings, like "LL" -> "MMMM D YYYY"
-	formatStr = date1.lang().longDateFormat(formatStr) || formatStr;
+	formatStr = localeData.longDateFormat(formatStr) || formatStr;
 	// BTW, this is not important for `formatDate` because it is impossible to put custom tokens
 	// or non-zero areas in Moment's localized format strings.