fix: memoize formatFullDate calls

ts/components/conversation/Timestamp.tsx

@@ -3,7 +3,7 @@ import useUpdate from 'react-use/lib/useUpdate';
 import styled from 'styled-components';
 import { CONVERSATION } from '../../session/constants';
 import { getConversationItemString } from '../../util/i18n/formatting/conversationItemTimestamp';
-import { formatFullDate } from '../../util/i18n/formatting/generics';
+import { useFormatFullDate } from '../../hooks/useFormatFullDate';
 
 type Props = {
   timestamp?: number;
@@ -37,6 +37,7 @@ export const Timestamp = (props: Props) => {
   useInterval(update, UPDATE_FREQUENCY);
 
   const { timestamp, isConversationSearchResult } = props;
+  const formattedFullDate = useFormatFullDate(timestamp);
 
   if (timestamp === null || timestamp === undefined) {
     return null;
@@ -48,7 +49,7 @@ export const Timestamp = (props: Props) => {
   if (timestamp !== CONVERSATION.LAST_JOINED_FALLBACK_TIMESTAMP) {
     dateString = getConversationItemString(new Date(timestamp));
 
-    title = formatFullDate(new Date(timestamp));
+    title = formattedFullDate;
   }
 
   if (isConversationSearchResult) {

ts/components/conversation/header/ConversationHeader.tsx

@@ -28,6 +28,7 @@ import { SessionButtonColor, SessionButton, SessionButtonType } from '../../basi
 import { useAreGroupsCreatedAsNewGroupsYet } from '../../../state/selectors/releasedFeatures';
 import { ConvoHub } from '../../../session/conversations';
 import { ConversationTypeEnum } from '../../../models/types';
+import { Constants } from '../../../session';
 
 export const ConversationHeaderWithDetails = () => {
   const isSelectionMode = useIsMessageSelectionMode();
@@ -145,7 +146,9 @@ function RecreateGroupButton() {
                 ConversationTypeEnum.PRIVATE
               );
               if (!memberConvo.get('active_at')) {
-                memberConvo.set({ active_at: 1 });
+                memberConvo.set({
+                  active_at: Constants.CONVERSATION.LAST_JOINED_FALLBACK_TIMESTAMP,
+                });
                 await memberConvo.commit();
               }
               /* eslint-enable no-await-in-loop */

ts/components/conversation/message/message-content/MessageContent.tsx

@@ -26,7 +26,7 @@ import { MessageHighlighter } from './MessageHighlighter';
 import { MessageLinkPreview } from './MessageLinkPreview';
 import { MessageQuote } from './MessageQuote';
 import { MessageText } from './MessageText';
-import { formatFullDate } from '../../../../util/i18n/formatting/generics';
+import { useFormatFullDate } from '../../../../hooks/useFormatFullDate';
 
 export type MessageContentSelectorProps = Pick<
   MessageRenderingProps,
@@ -125,16 +125,16 @@ export const MessageContent = (props: Props) => {
     shouldHighlightMessage,
   ]);
 
+  const toolTipTitle = useFormatFullDate(contentProps?.serverTimestamp || contentProps?.timestamp);
+
   if (!contentProps) {
     return null;
   }
 
-  const { direction, text, timestamp, serverTimestamp, previews, quote } = contentProps;
+  const { direction, text, previews, quote } = contentProps;
 
   const hasContentBeforeAttachment = !isEmpty(previews) || !isEmpty(quote) || !isEmpty(text);
 
-  const toolTipTitle = formatFullDate(new Date(serverTimestamp || timestamp));
-
   return (
     <StyledMessageContent
       className={classNames('module-message__container', `module-message__container--${direction}`)}

ts/components/conversation/message/message-item/DateBreak.tsx

@@ -1,9 +1,7 @@
 import styled from 'styled-components';
 import { DURATION } from '../../../../session/constants';
-import {
-  formatFullDate,
-  formatRelativeTimestampWithLocale,
-} from '../../../../util/i18n/formatting/generics';
+import { formatRelativeTimestampWithLocale } from '../../../../util/i18n/formatting/generics';
+import { useFormatFullDate } from '../../../../hooks/useFormatFullDate';
 
 const DateBreakContainer = styled.div``;
 
@@ -20,12 +18,13 @@ const DateBreakText = styled.div`
 
 export const MessageDateBreak = (props: { timestamp: number; messageId: string }) => {
   const { timestamp, messageId } = props;
+  const formattedFullDate = useFormatFullDate(timestamp);
   // if less than 7 days, we display the "last Thursday at 4:10" syntax
   // otherwise, we display the date + time separately
   const text =
     Date.now() - timestamp <= DURATION.DAYS * 7
       ? formatRelativeTimestampWithLocale(timestamp)
-      : formatFullDate(new Date(timestamp));
+      : formattedFullDate;
 
   return (
     <DateBreakContainer id={`date-break-${messageId}`}>

ts/hooks/useFormatFullDate.tsx

@@ -0,0 +1,12 @@
+import { useMemo } from 'react';
+import { formatFullDate } from '../util/i18n/formatting/generics';
+import { CONVERSATION } from '../session/constants';
+
+export function useFormatFullDate(timestampMs?: number) {
+  return useMemo(() => {
+    if (!timestampMs || timestampMs === CONVERSATION.LAST_JOINED_FALLBACK_TIMESTAMP) {
+      return '';
+    }
+    return formatFullDate(new Date(timestampMs));
+  }, [timestampMs]);
+}

ts/localization/constants.ts

@@ -96,4 +96,3 @@ export type CrowdinLocale = (typeof crowdinLocales)[number];
 export function isCrowdinLocale(locale: string): locale is CrowdinLocale {
   return crowdinLocales.includes(locale as CrowdinLocale);
 }
-