diff --git a/src/applications/ask-va/config/helpers.jsx b/src/applications/ask-va/config/helpers.jsx
index baeefa6c0427..c2f334bd5eb1 100644
--- a/src/applications/ask-va/config/helpers.jsx
+++ b/src/applications/ask-va/config/helpers.jsx
@@ -1,5 +1,6 @@
 import { format, isValid, parse } from 'date-fns';
-import { utcToZonedTime } from 'date-fns-tz';
+import { formatInTimeZone } from 'date-fns-tz';
+import { enUS } from 'date-fns/locale';
 import React from 'react';
 
 import {
@@ -691,15 +692,31 @@ export const getDescriptiveTextFromCRM = status => {
 // Function to convert date to Response Inbox format using date-fns
 export const convertDateForInquirySubheader = dateString => {
   // Parse the input date string as UTC
-  const utcDate = parse(dateString, 'MM/dd/yyyy h:mm:ss a', new Date());
+  let utcDate;
+  try {
+    utcDate = parse(dateString, 'M/d/yyyy h:mm:ss a', new Date(0));
+    utcDate.setUTCFullYear(utcDate.getFullYear());
+    utcDate.setUTCMonth(utcDate.getMonth());
+    utcDate.setUTCDate(utcDate.getDate());
+    utcDate.setUTCHours(utcDate.getHours());
+    utcDate.setUTCMinutes(utcDate.getMinutes());
+    utcDate.setUTCSeconds(utcDate.getSeconds());
+  } catch (error) {
+    return 'Invalid Date';
+  }
 
-  // Convert UTC to Eastern Time
-  const easternTime = utcToZonedTime(utcDate, 'America/New_York');
+  // Ensure the date is valid
+  if (isNaN(utcDate.getTime())) {
+    return 'Invalid Date';
+  }
 
-  // Format the date in Eastern Time
-  return format(easternTime, "MMM. d, yyyy 'at' h:mm aaaa 'E.T'", {
-    timeZone: 'America/New_York',
-  }).replace(/AM|PM/, match => `${match.toLowerCase()}.`);
+  // Format the UTC date in Eastern Time
+  return formatInTimeZone(
+    utcDate,
+    'America/New_York',
+    "MMM. d, yyyy 'at' h:mm aaaa 'E.T'",
+    { locale: enUS },
+  ).replace(/AM|PM/, match => `${match.toLowerCase()}.`);
 };
 
 export const formatDate = (dateString, formatType = 'short') => {
diff --git a/src/applications/ask-va/containers/ResponseInboxPage.jsx b/src/applications/ask-va/containers/ResponseInboxPage.jsx
index 481daa954d9a..b7d3ea641bb2 100644
--- a/src/applications/ask-va/containers/ResponseInboxPage.jsx
+++ b/src/applications/ask-va/containers/ResponseInboxPage.jsx
@@ -7,6 +7,7 @@ import {
 import { isLoggedIn } from '@department-of-veterans-affairs/platform-user/selectors';
 import { apiRequest } from '@department-of-veterans-affairs/platform-utilities/api';
 import { focusElement } from '@department-of-veterans-affairs/platform-utilities/ui';
+import { parse } from 'date-fns';
 import DOMPurify from 'dompurify';
 import PropTypes from 'prop-types';
 import React, { useCallback, useEffect, useState } from 'react';
@@ -37,6 +38,7 @@ const emptyMessage = message => (
 const getReplySubHeader = messageType => {
   if (!messageType) return 'No messageType';
   if (messageType === 'ResponseFromVA') return 'Response from VA';
+  if (messageType === 'ReplyToVA') return 'Reply to VA';
   // Split the string at capital letters and join with spaces
   return messageType.split(/(?=[A-Z])/).join(' ');
 };
@@ -232,21 +234,39 @@ const ResponseInboxPage = ({ router }) => {
         ),
         messageType: 'Your question',
         description: inquiryData.attributes.submitterQuestion,
+        originalCreatedOn: inquiryData.attributes.createdOn,
       },
     },
-    ...inquiryData.attributes.correspondences.data
-      .filter(corr => corr.attributes.messageType !== 'Notification')
-      .map(corr => ({
-        ...corr,
-        attributes: {
-          ...corr.attributes,
-          createdOn: convertDateForInquirySubheader(corr.attributes.createdOn),
-          modifiedOn: convertDateForInquirySubheader(
-            corr.attributes.modifiedOn,
-          ),
-        },
-      })),
-  ];
+    ...(inquiryData.attributes.correspondences.data
+      ? inquiryData.attributes.correspondences.data
+          .filter(corr => corr.attributes.messageType !== 'Notification')
+          .map(corr => ({
+            ...corr,
+            attributes: {
+              ...corr.attributes,
+              createdOn: convertDateForInquirySubheader(
+                corr.attributes.createdOn,
+              ),
+              modifiedOn: convertDateForInquirySubheader(
+                corr.attributes.modifiedOn,
+              ),
+              originalCreatedOn: corr.attributes.createdOn,
+            },
+          }))
+      : []),
+  ].sort((a, b) => {
+    const dateA = parse(
+      a.attributes.originalCreatedOn,
+      'MM/dd/yyyy h:mm:ss a',
+      new Date(),
+    );
+    const dateB = parse(
+      b.attributes.originalCreatedOn,
+      'MM/dd/yyyy h:mm:ss a',
+      new Date(),
+    );
+    return dateA.getTime() - dateB.getTime();
+  });
 
   return (
     <div className="row vads-u-padding-x--1">