diff --git a/test/api/v3/unit/libs/slack.js b/test/api/v3/unit/libs/slack.js
index e660a340d2..9a6d183d33 100644
--- a/test/api/v3/unit/libs/slack.js
+++ b/test/api/v3/unit/libs/slack.js
@@ -5,6 +5,7 @@ import slack from '../../../../../website/server/libs/slack';
 import logger from '../../../../../website/server/libs/logger';
 import { TAVERN_ID } from '../../../../../website/server/models/group';
 import nconf from 'nconf';
+import moment from 'moment';
 
 describe('slack', () => {
   describe('sendFlagNotification', () => {
@@ -45,13 +46,15 @@ describe('slack', () => {
     it('sends a slack webhook', () => {
       slack.sendFlagNotification(data);
 
+      const timestamp = `${moment(data.message.timestamp).utc().format('YYYY-MM-DD HH:mm')} UTC`;
+
       expect(IncomingWebhook.prototype.send).to.be.calledOnce;
       expect(IncomingWebhook.prototype.send).to.be.calledWith({
         text: 'flagger (flagger-id; language: flagger-lang) flagged a message',
         attachments: [{
           fallback: 'Flag Message',
           color: 'danger',
-          author_name: 'Author - author@example.com - author-id',
+          author_name: `Author - author@example.com - author-id\n${timestamp}`,
           title: 'Flag in Some group - (private guild)',
           title_link: undefined,
           text: 'some text',
@@ -97,9 +100,11 @@ describe('slack', () => {
 
       slack.sendFlagNotification(data);
 
+      const timestamp = `${moment(data.message.timestamp).utc().format('YYYY-MM-DD HH:mm')} UTC`;
+
       expect(IncomingWebhook.prototype.send).to.be.calledWithMatch({
         attachments: [sandbox.match({
-          author_name: 'System Message',
+          author_name: `System Message\n${timestamp}`,
         })],
       });
     });
diff --git a/website/server/libs/slack.js b/website/server/libs/slack.js
index 44dbd9e95b..0ff3eae014 100644
--- a/website/server/libs/slack.js
+++ b/website/server/libs/slack.js
@@ -3,6 +3,7 @@ import { IncomingWebhook } from '@slack/client';
 import logger from './logger';
 import { TAVERN_ID } from '../models/group';
 import nconf from 'nconf';
+import moment from 'moment';
 
 const SLACK_FLAGGING_URL = nconf.get('SLACK:FLAGGING_URL');
 const SLACK_FLAGGING_FOOTER_LINK = nconf.get('SLACK:FLAGGING_FOOTER_LINK');
@@ -52,12 +53,14 @@ function sendFlagNotification ({
     authorName = `${message.user} - ${authorEmail} - ${message.uuid}`;
   }
 
+  const timestamp = `${moment(message.timestamp).utc().format('YYYY-MM-DD HH:mm')} UTC`;
+
   flagSlack.send({
     text,
     attachments: [{
       fallback: 'Flag Message',
       color: 'danger',
-      author_name: authorName,
+      author_name: `${authorName}\n${timestamp}`,
       title,
       title_link: titleLink,
       text: message.text,