diff --git a/core/frontend/apps/amp/lib/helpers/amp_content.js b/core/frontend/apps/amp/lib/helpers/amp_content.js
index 7aabd91266..68fd196397 100644
--- a/core/frontend/apps/amp/lib/helpers/amp_content.js
+++ b/core/frontend/apps/amp/lib/helpers/amp_content.js
@@ -8,7 +8,7 @@
 // there if available. The cacheId is a combination of `updated_at` and the `slug`.
 const Promise = require('bluebird');
 
-const moment = require('moment');
+const {DateTime, Interval} = require('luxon');
 const errors = require('@tryghost/errors');
 const logging = require('@tryghost/logging');
 
@@ -119,14 +119,26 @@ function getAmperizeHTML(html, post) {
     }
 
     let Amperize = require('amperize');
-    let startedAtMoment = moment();
 
     amperize = amperize || new Amperize();
 
-    if (!amperizeCache[post.id] || moment(new Date(amperizeCache[post.id].updated_at)).diff(new Date(post.updated_at)) < 0) {
+    const startedAtMoment = DateTime.now();
+
+    let cacheDateTime;
+    let postDateTime;
+
+    if (amperizeCache[post.id]) {
+        const {updated_at: ampCacheUpdatedAt} = amperizeCache[post.id];
+        const {updated_at: postUpdatedAt} = post;
+
+        cacheDateTime = DateTime.fromJSDate(new Date(ampCacheUpdatedAt));
+        postDateTime = DateTime.fromJSDate(new Date(postUpdatedAt));
+    }
+
+    if (!amperizeCache[post.id] || cacheDateTime.diff(postDateTime).valueOf() < 0) {
         return new Promise((resolve) => {
             amperize.parse(html, (err, res) => {
-                logging.info('amp.parse', post.url, moment().diff(startedAtMoment, 'ms') + 'ms');
+                logging.info('amp.parse', post.url, Interval.fromDateTimes(startedAtMoment, DateTime.now()).length('milliseconds') + 'ms');
 
                 if (err) {
                     if (err.src) {