Use local date format.

src/app/atoms/time/Time.tsx

@@ -1,14 +1,18 @@
 import React from "react";
-import PropTypes from "prop-types";
 
 import dateFormat from "dateformat";
 import { isInSameDay } from "../../../util/common";
 
-function Time({ timestamp, fullTime }) {
+export interface TimeProps {
+  timestamp: number;
+  fullTime: boolean;
+}
+
+function Time({ timestamp, fullTime }: TimeProps) {
   const date = new Date(timestamp);
 
   const formattedFullTime = dateFormat(date, "dd mmmm yyyy, hh:MM TT");
-  let formattedDate = formattedFullTime;
+  let formattedDateTime = formattedFullTime;
 
   if (!fullTime) {
     const compareDate = new Date();
@@ -16,18 +20,21 @@ function Time({ timestamp, fullTime }) {
     compareDate.setDate(compareDate.getDate() - 1);
     const isYesterday = isInSameDay(date, compareDate);
 
-    formattedDate = dateFormat(
+    const dtf = new Intl.DateTimeFormat();
+    const formattedDate = dtf.format(date);
+
+    formattedDateTime = dateFormat(
       date,
-      isToday || isYesterday ? "hh:MM TT" : "dd/mm/yyyy"
+      isToday || isYesterday ? "hh:MM TT" : formattedDate
     );
     if (isYesterday) {
-      formattedDate = `Yesterday, ${formattedDate}`;
+      formattedDateTime = `Yesterday, ${formattedDateTime}`;
     }
   }
 
   return (
     <time dateTime={date.toISOString()} title={formattedFullTime}>
-      {formattedDate}
+      {formattedDateTime}
     </time>
   );
 }
@@ -36,9 +43,4 @@ Time.defaultProps = {
   fullTime: false,
 };
 
-Time.propTypes = {
-  timestamp: PropTypes.number.isRequired,
-  fullTime: PropTypes.bool,
-};
-
 export default Time;