diff --git a/ghost/core/test/e2e-api/members/__snapshots__/middleware.test.js.snap b/ghost/core/test/e2e-api/members/__snapshots__/middleware.test.js.snap
index be16dd94d8..12e4cf04df 100644
--- a/ghost/core/test/e2e-api/members/__snapshots__/middleware.test.js.snap
+++ b/ghost/core/test/e2e-api/members/__snapshots__/middleware.test.js.snap
@@ -3,7 +3,7 @@
 exports[`Comments API when authenticated can get member data 1: [body] 1`] = `
 Object {
   "avatar_image": null,
-  "created_at": "2023-04-04T18:30:54.000Z",
+  "created_at": StringMatching /\\\\d\\{4\\}-\\\\d\\{2\\}-\\\\d\\{2\\}T\\\\d\\{2\\}:\\\\d\\{2\\}:\\\\d\\{2\\}\\\\\\.000Z/,
   "email": "member@example.com",
   "email_suppression": Object {
     "info": null,
@@ -49,7 +49,7 @@ Object {
 exports[`Comments API when authenticated can remove member from suppression list and resubscribe to default newsletters 1: [body] 1`] = `
 Object {
   "avatar_image": null,
-  "created_at": "2023-04-04T18:30:54.000Z",
+  "created_at": StringMatching /\\\\d\\{4\\}-\\\\d\\{2\\}-\\\\d\\{2\\}T\\\\d\\{2\\}:\\\\d\\{2\\}:\\\\d\\{2\\}\\\\\\.000Z/,
   "email": "member@example.com",
   "email_suppression": Object {
     "info": null,
@@ -82,7 +82,7 @@ Object {
 exports[`Comments API when authenticated can remove member from suppression list and resubscribe to default newsletters 3: [body] 1`] = `
 Object {
   "avatar_image": null,
-  "created_at": "2023-04-04T18:30:54.000Z",
+  "created_at": StringMatching /\\\\d\\{4\\}-\\\\d\\{2\\}-\\\\d\\{2\\}T\\\\d\\{2\\}:\\\\d\\{2\\}:\\\\d\\{2\\}\\\\\\.000Z/,
   "email": "member@example.com",
   "email_suppression": Object {
     "info": null,
@@ -128,7 +128,7 @@ Object {
 exports[`Comments API when authenticated can update comment notifications 1: [body] 1`] = `
 Object {
   "avatar_image": null,
-  "created_at": "2023-04-04T18:30:54.000Z",
+  "created_at": StringMatching /\\\\d\\{4\\}-\\\\d\\{2\\}-\\\\d\\{2\\}T\\\\d\\{2\\}:\\\\d\\{2\\}:\\\\d\\{2\\}\\\\\\.000Z/,
   "email": "member@example.com",
   "email_suppression": Object {
     "info": null,
@@ -266,7 +266,7 @@ Object {
 exports[`Comments API when authenticated can update member expertise 1: [body] 1`] = `
 Object {
   "avatar_image": null,
-  "created_at": "2023-04-04T18:30:54.000Z",
+  "created_at": StringMatching /\\\\d\\{4\\}-\\\\d\\{2\\}-\\\\d\\{2\\}T\\\\d\\{2\\}:\\\\d\\{2\\}:\\\\d\\{2\\}\\\\\\.000Z/,
   "email": "member@example.com",
   "email_suppression": Object {
     "info": null,
@@ -312,7 +312,7 @@ Object {
 exports[`Comments API when authenticated can update name 1: [body] 1`] = `
 Object {
   "avatar_image": null,
-  "created_at": "2023-04-04T18:30:54.000Z",
+  "created_at": StringMatching /\\\\d\\{4\\}-\\\\d\\{2\\}-\\\\d\\{2\\}T\\\\d\\{2\\}:\\\\d\\{2\\}:\\\\d\\{2\\}\\\\\\.000Z/,
   "email": "member@example.com",
   "email_suppression": Object {
     "info": null,
@@ -358,7 +358,7 @@ Object {
 exports[`Comments API when authenticated trims whitespace from expertise 1: [body] 1`] = `
 Object {
   "avatar_image": null,
-  "created_at": "2023-04-04T18:30:54.000Z",
+  "created_at": StringMatching /\\\\d\\{4\\}-\\\\d\\{2\\}-\\\\d\\{2\\}T\\\\d\\{2\\}:\\\\d\\{2\\}:\\\\d\\{2\\}\\\\\\.000Z/,
   "email": "member@example.com",
   "email_suppression": Object {
     "info": null,
diff --git a/ghost/core/test/e2e-api/members/middleware.test.js b/ghost/core/test/e2e-api/members/middleware.test.js
index bc79602159..5823f96285 100644
--- a/ghost/core/test/e2e-api/members/middleware.test.js
+++ b/ghost/core/test/e2e-api/members/middleware.test.js
@@ -8,6 +8,7 @@ let membersAgent;
 const memberMatcher = (newslettersCount) => {
     return {
         uuid: anyUuid,
+        created_at: anyISODateTime,
         newsletters: new Array(newslettersCount).fill(
             {
                 id: anyObjectId