diff --git a/endpoints/api/repository_models_interface.py b/endpoints/api/repository_models_interface.py
index ac54769d7..2d5088942 100644
--- a/endpoints/api/repository_models_interface.py
+++ b/endpoints/api/repository_models_interface.py
@@ -151,13 +151,14 @@ class Release(
 class Tag(
     namedtuple('Tag', [
       'name', 'image_docker_image_id', 'image_aggregate_size', 'lifetime_start_ts',
-      'tag_manifest_digest'
+      'tag_manifest_digest', 'lifetime_end_ts',
     ])):
   """
   :type name: string
   :type image_docker_image_id: string
   :type image_aggregate_size: int
   :type lifetime_start_ts: int
+  :type lifetime_end_ts: int|None
   :type tag_manifest_digest: string
 
   """
@@ -173,6 +174,10 @@ class Tag(
       last_modified = format_date(datetime.fromtimestamp(self.lifetime_start_ts))
       tag_info['last_modified'] = last_modified
 
+    if self.lifetime_end_ts:
+      expiration = format_date(datetime.fromtimestamp(self.lifetime_end_ts))
+      tag_info['expiration'] = expiration
+
     if self.tag_manifest_digest is not None:
       tag_info['manifest_digest'] = self.tag_manifest_digest
 
diff --git a/endpoints/api/repository_models_pre_oci.py b/endpoints/api/repository_models_pre_oci.py
index d25ef432d..16a76bbc2 100644
--- a/endpoints/api/repository_models_pre_oci.py
+++ b/endpoints/api/repository_models_pre_oci.py
@@ -159,7 +159,7 @@ class PreOCIModel(RepositoryDataInterface):
 
     return ImageRepositoryRepository(base, [
       Tag(tag.name, tag.image.docker_image_id, tag.image.aggregate_size, tag.lifetime_start_ts,
-          tag.tagmanifest.digest) for tag in tags
+          tag.tagmanifest.digest, tag.lifetime_end_ts) for tag in tags
     ], [Count(count.date, count.count) for count in counts], repo.badge_token, repo.trust_enabled)