diff --git a/moment/moment-external-tests.ts b/moment/moment-external-tests.ts
index ed3e1e2a82..c8108d1b99 100644
--- a/moment/moment-external-tests.ts
+++ b/moment/moment-external-tests.ts
@@ -255,6 +255,7 @@ moment.locale('en', {
     weekdaysShort: ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"],
     weekdaysMin: ["Su", "Mo", "Tu", "We", "Th", "Fr", "Sa"],
     longDateFormat: {
+        LTS: "h:mm:ss A",
         LT: "h:mm A",
         L: "MM/DD/YYYY",
         LL: "MMMM D YYYY",
@@ -376,6 +377,7 @@ moment.locale('en', {
 
 moment.locale('en', {
     longDateFormat : {
+        LTS: "h:mm:ss A",
         LT: "h:mm A",
         L: "MM/DD/YYYY",
         l: "M/D/YYYY",
@@ -390,6 +392,7 @@ moment.locale('en', {
 
 moment.locale('en', {
     longDateFormat : {
+        LTS: "h:mm:ss A",
         LT: "h:mm A",
         L: "MM/DD/YYYY",
         LL: "MMMM Do YYYY",
diff --git a/moment/moment-node.d.ts b/moment/moment-node.d.ts
index c67b4f742e..babde41c92 100644
--- a/moment/moment-node.d.ts
+++ b/moment/moment-node.d.ts
@@ -19,7 +19,7 @@ declare module moment {
         month?: number;
         /** Month */
         M?: number;
-        
+
         /** Week */
         weeks?: number;
         /** Week */
@@ -346,11 +346,13 @@ declare module moment {
       LLL: string;
       LLLL: string;
       LT: string;
+      LTS: string;
       l?: string;
       ll?: string;
       lll?: string;
       llll?: string;
       lt?: string;
+      lts?: string;
     }
 
     interface MomentRelativeTime {
diff --git a/moment/moment-tests.ts b/moment/moment-tests.ts
index 28fedc65e2..14e58c6128 100644
--- a/moment/moment-tests.ts
+++ b/moment/moment-tests.ts
@@ -266,6 +266,7 @@ moment.locale('en', {
     weekdaysShort: ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"],
     weekdaysMin: ["Su", "Mo", "Tu", "We", "Th", "Fr", "Sa"],
     longDateFormat: {
+        LTS: "h:mm:ss A",
         LT: "h:mm A",
         L: "MM/DD/YYYY",
         LL: "MMMM D YYYY",
@@ -387,6 +388,7 @@ moment.locale('en', {
 
 moment.locale('en', {
     longDateFormat : {
+        LTS: "h:mm:ss A",
         LT: "h:mm A",
         L: "MM/DD/YYYY",
         l: "M/D/YYYY",
@@ -401,6 +403,7 @@ moment.locale('en', {
 
 moment.locale('en', {
     longDateFormat : {
+        LTS: "h:mm A",
         LT: "h:mm A",
         L: "MM/DD/YYYY",
         LL: "MMMM Do YYYY",