diff --git a/app/Http/Controllers/Api/ApiV1Controller.php b/app/Http/Controllers/Api/ApiV1Controller.php
index a376865e2..61dc05d42 100644
--- a/app/Http/Controllers/Api/ApiV1Controller.php
+++ b/app/Http/Controllers/Api/ApiV1Controller.php
@@ -1008,7 +1008,7 @@ class ApiV1Controller extends Controller
 			->map(function($like) {
 				$status =  StatusService::getMastodon($like['status_id'], false);
 				$status['like_id'] = $like->id;
-				$status['liked_at'] = $like->created_at->format('c');
+				$status['liked_at'] = str_replace('+00:00', 'Z', $like->created_at->format(DATE_RFC3339_EXTENDED));
 				return $status;
 			})
 			->filter(function($status) {
diff --git a/app/Http/Controllers/Api/InstanceApiController.php b/app/Http/Controllers/Api/InstanceApiController.php
index 80ca2169d..6edd27de3 100644
--- a/app/Http/Controllers/Api/InstanceApiController.php
+++ b/app/Http/Controllers/Api/InstanceApiController.php
@@ -19,7 +19,7 @@ class InstanceApiController extends Controller {
 				'acct'			  => $admin->username,
 				'display_name' 	  => e($admin->name),
 				'locked' 		  => (bool) $admin->is_private,
-				'created_at' 	  => $admin->created_at->format('c'),
+				'created_at' 	  => str_replace('+00:00', 'Z', $admin->created_at->format(DATE_RFC3339_EXTENDED)),
 				'note' 			  => e($admin->bio),
 				'url' 			  => $admin->url(),
 				'avatar' 		  => $admin->avatarUrl(),
diff --git a/app/Http/Controllers/InternalApiController.php b/app/Http/Controllers/InternalApiController.php
index 9280ad4a5..299c9ceb6 100644
--- a/app/Http/Controllers/InternalApiController.php
+++ b/app/Http/Controllers/InternalApiController.php
@@ -326,7 +326,7 @@ class InternalApiController extends Controller
 				if(!$status) {
 					return false;
 				}
-				$status['bookmarked_at'] = $bookmark->created_at->format('c');
+				$status['bookmarked_at'] = str_replace('+00:00', 'Z', $bookmark->created_at->format(DATE_RFC3339_EXTENDED));
 
 				if($status) {
 					BookmarkService::add($pid, $status['id']);
diff --git a/app/Services/AdminStatsService.php b/app/Services/AdminStatsService.php
index 3f1f1a74c..dbd52276e 100644
--- a/app/Services/AdminStatsService.php
+++ b/app/Services/AdminStatsService.php
@@ -37,7 +37,7 @@ class AdminStatsService
         return Cache::remember('admin:dashboard:storage:stats', 120000, function() {
             $res = [];
 
-            $res['last_updated'] = now()->format('c');
+            $res['last_updated'] = str_replace('+00:00', 'Z', now()->format(DATE_RFC3339_EXTENDED));
 
             $avatars = Avatar::count();
             $avatarsLocal = Avatar::whereNull('cdn_url')->count();
diff --git a/app/Services/MarkerService.php b/app/Services/MarkerService.php
index 619af9748..6b407b567 100644
--- a/app/Services/MarkerService.php
+++ b/app/Services/MarkerService.php
@@ -20,7 +20,7 @@ class MarkerService
 		$val = [
 			'last_read_id' => (string) $entityId,
 			'version' => $existing ? ($existing['version'] + 1) : 1,
-			'updated_at' => now()->format('c')
+			'updated_at' => str_replace('+00:00', 'Z', now()->format(DATE_RFC3339_EXTENDED))
 		];
 		Cache::put($key, $val, 2592000);
 		return $val;
diff --git a/app/Services/PollService.php b/app/Services/PollService.php
index 8c30af7dc..78de660de 100644
--- a/app/Services/PollService.php
+++ b/app/Services/PollService.php
@@ -19,7 +19,7 @@ class PollService
 			$poll = Poll::whereStatusId($id)->firstOrFail();
 			return [
 				'id' => (string) $poll->id,
-				'expires_at' => $poll->expires_at->format('c'),
+				'expires_at' => str_replace('+00:00', 'Z', $poll->expires_at->format(DATE_RFC3339_EXTENDED)),
 				'expired' => null,
 				'multiple' => $poll->multiple,
 				'votes_count' => $poll->votes_count,
diff --git a/app/Status.php b/app/Status.php
index 67fcffb6a..ba1614a60 100644
--- a/app/Status.php
+++ b/app/Status.php
@@ -333,7 +333,7 @@ class Status extends Model
 			'id'    => $this->permalink(),
 			'type'  => 'Create',
 			'actor' => $profile->permalink(),
-			'published' => $this->created_at->format('c'),
+			'published' => str_replace('+00:00', 'Z', $this->created_at->format(DATE_RFC3339_EXTENDED)),
 			'to' => $to,
 			'cc' => $cc,
 			'object' => [
@@ -341,7 +341,7 @@ class Status extends Model
 				'type' => 'Note',
 				'summary' => null,
 				'inReplyTo' => null,
-				'published' => $this->created_at->format('c'),
+				'published' => str_replace('+00:00', 'Z', $this->created_at->format(DATE_RFC3339_EXTENDED)),
 				'url' => $this->url(),
 				'attributedTo' => $this->profile->url(),
 				'to' => $to,
diff --git a/app/Transformer/Api/NotificationTransformer.php b/app/Transformer/Api/NotificationTransformer.php
index e6f0ca6db..df8d0d30c 100644
--- a/app/Transformer/Api/NotificationTransformer.php
+++ b/app/Transformer/Api/NotificationTransformer.php
@@ -16,7 +16,7 @@ class NotificationTransformer extends Fractal\TransformerAbstract
 		$res = [
 			'id'       		=> (string) $notification->id,
 			'type'       	=> $this->replaceTypeVerb($notification->action),
-			'created_at' 	=> (string) $notification->created_at->format('c'),
+			'created_at' 	=> (string) str_replace('+00:00', 'Z', $notification->created_at->format(DATE_RFC3339_EXTENDED)),
 		];
 
 		$n = $notification;
diff --git a/app/Transformer/Api/StatusStatelessTransformer.php b/app/Transformer/Api/StatusStatelessTransformer.php
index 927fac9e5..f1b194b9c 100644
--- a/app/Transformer/Api/StatusStatelessTransformer.php
+++ b/app/Transformer/Api/StatusStatelessTransformer.php
@@ -35,7 +35,7 @@ class StatusStatelessTransformer extends Fractal\TransformerAbstract
 			'reblog'                    => null,
 			'content'                   => $status->rendered ?? $status->caption,
 			'content_text'              => $status->caption,
-			'created_at'                => $status->created_at->format('c'),
+			'created_at'                => str_replace('+00:00', 'Z', $status->created_at->format(DATE_RFC3339_EXTENDED)),
 			'emojis'                    => CustomEmoji::scan($status->caption),
 			'reblogs_count'             => $status->reblogs_count ?? 0,
 			'favourites_count'          => $status->likes_count ?? 0,
diff --git a/app/Transformer/Api/StatusTransformer.php b/app/Transformer/Api/StatusTransformer.php
index cc712fa2a..c5657c827 100644
--- a/app/Transformer/Api/StatusTransformer.php
+++ b/app/Transformer/Api/StatusTransformer.php
@@ -38,7 +38,7 @@ class StatusTransformer extends Fractal\TransformerAbstract
 			'reblog'                    => null,
 			'content'                   => $status->rendered ?? $status->caption,
 			'content_text'              => $status->caption,
-			'created_at'                => $status->created_at->format('c'),
+			'created_at'                => str_replace('+00:00', 'Z', $status->created_at->format(DATE_RFC3339_EXTENDED)),
 			'emojis'                    => CustomEmoji::scan($status->caption),
 			'reblogs_count'             => 0,
 			'favourites_count'          => $status->likes_count ?? 0,