diff --git a/ts/components/conversation/Timestamp.tsx b/ts/components/conversation/Timestamp.tsx
index f21913f72..a46b1445c 100644
--- a/ts/components/conversation/Timestamp.tsx
+++ b/ts/components/conversation/Timestamp.tsx
@@ -3,6 +3,7 @@ import moment from 'moment';
 import useInterval from 'react-use/lib/useInterval';
 import useUpdate from 'react-use/lib/useUpdate';
 import styled from 'styled-components';
+import { CONVERSATION } from '../../session/constants';
 
 type Props = {
   timestamp?: number;
@@ -39,14 +40,20 @@ export const Timestamp = (props: Props) => {
     return null;
   }
 
-  const momentValue = moment(timestamp);
-  // this is a hack to make the date string shorter, looks like moment does not have a localized way of doing this for now.
+  let title = '';
+  let dateString = '';
 
-  const dateString = momentFromNow
-    ? momentValue.fromNow().replace('minutes', 'mins').replace('minute', 'min')
-    : momentValue.format('lll');
+  if (timestamp !== CONVERSATION.LAST_JOINED_FALLBACK_TIMESTAMP) {
+    const momentValue = moment(timestamp);
+    // this is a hack to make the date string shorter, looks like moment does not have a localized way of doing this for now.
+
+    dateString = momentFromNow
+      ? momentValue.fromNow().replace('minutes', 'mins').replace('minute', 'min')
+      : momentValue.format('lll');
+
+    title = moment(timestamp).format('llll');
+  }
 
-  const title = moment(timestamp).format('llll');
   if (props.isConversationListItem) {
     return <TimestampContainerListItem title={title}>{dateString}</TimestampContainerListItem>;
   }
diff --git a/ts/components/leftpane/overlay/OverlayClosedGroup.tsx b/ts/components/leftpane/overlay/OverlayClosedGroup.tsx
index 78a858d55..6a27c1e3c 100644
--- a/ts/components/leftpane/overlay/OverlayClosedGroup.tsx
+++ b/ts/components/leftpane/overlay/OverlayClosedGroup.tsx
@@ -58,7 +58,7 @@ const NoContacts = () => {
 };
 
 /**
- * Makes some validity check and return true if the group was indead created
+ * Makes some validity check and return true if the group was indeed created
  */
 async function createClosedGroupWithErrorHandling(
   groupName: string,
@@ -75,13 +75,14 @@ async function createClosedGroupWithErrorHandling(
     return false;
   }
 
-  // >= because we add ourself as a member AFTER this. so a 10 group is already invalid as it will be 11 with ourself
+  // >= because we add ourself as a member AFTER this. so a 10 group is already invalid as it will be 11 when we are included
   // the same is valid with groups count < 1
 
   if (groupMemberIds.length < 1) {
     onError(window.i18n('pickClosedGroupMember'));
     return false;
   }
+
   if (groupMemberIds.length >= VALIDATION.CLOSED_GROUP_SIZE_LIMIT) {
     onError(window.i18n('closedGroupMaxSize'));
     return false;
diff --git a/ts/receiver/configMessage.ts b/ts/receiver/configMessage.ts
index 2b680fa07..a0ebac3ef 100644
--- a/ts/receiver/configMessage.ts
+++ b/ts/receiver/configMessage.ts
@@ -52,6 +52,7 @@ import { HexKeyPair } from './keypairs';
 import { queueAllCachedFromSource } from './receiver';
 import { EnvelopePlus } from './types';
 import { ConversationTypeEnum, CONVERSATION_PRIORITIES } from '../models/types';
+import { CONVERSATION } from '../session/constants';
 
 function groupByNamespace(incomingConfigs: Array<RetrieveMessageItemWithNamespace>) {
   const groupedByVariant: Map<
@@ -603,7 +604,10 @@ async function handleLegacyGroupUpdate(latestEnvelopeTimestamp: number) {
     const members = fromWrapper.members.map(m => m.pubkeyHex);
     const admins = fromWrapper.members.filter(m => m.isAdmin).map(m => m.pubkeyHex);
 
-    const creationTimestamp = fromWrapper.joinedAtSeconds ? fromWrapper.joinedAtSeconds * 1000 : 0;
+    const creationTimestamp = fromWrapper.joinedAtSeconds
+      ? fromWrapper.joinedAtSeconds * 1000
+      : CONVERSATION.LAST_JOINED_FALLBACK_TIMESTAMP;
+
     // then for all the existing legacy group in the wrapper, we need to override the field of what we have in the DB with what is in the wrapper
     // We only set group admins on group creation
     const groupDetails: ClosedGroup.GroupInfo = {
@@ -643,13 +647,12 @@ async function handleLegacyGroupUpdate(latestEnvelopeTimestamp: number) {
 
     const existingTimestampMs = legacyGroupConvo.get('lastJoinedTimestamp');
     const existingJoinedAtSeconds = Math.floor(existingTimestampMs / 1000);
-    if (existingJoinedAtSeconds !== fromWrapper.joinedAtSeconds) {
+    if (existingJoinedAtSeconds !== creationTimestamp) {
       legacyGroupConvo.set({
-        lastJoinedTimestamp: fromWrapper.joinedAtSeconds * 1000,
+        lastJoinedTimestamp: creationTimestamp,
       });
       changes = true;
     }
-
     // start polling for this group if we haven't left it yet. The wrapper does not store this info for legacy group so we check from the DB entry instead
     if (!legacyGroupConvo.get('isKickedFromGroup') && !legacyGroupConvo.get('left')) {
       getSwarmPollingInstance().addGroupId(PubKey.cast(fromWrapper.pubkeyHex));
diff --git a/ts/session/constants.ts b/ts/session/constants.ts
index 8351b2cf5..fa3782faf 100644
--- a/ts/session/constants.ts
+++ b/ts/session/constants.ts
@@ -62,6 +62,8 @@ export const CONVERSATION = {
   MAX_VOICE_MESSAGE_DURATION: 300,
   MAX_CONVO_UNREAD_COUNT: 999,
   MAX_GLOBAL_UNREAD_COUNT: 99, // the global one does not look good with 4 digits (999+) so we have a smaller one for it
+  /** NOTE some existing groups might not have joinedAtSeconds and we need a fallback value that is not falsy in order to poll and show up in the conversations list */
+  LAST_JOINED_FALLBACK_TIMESTAMP: 1,
 } as const;
 
 /**