diff --git a/examples/object_basic.py b/examples/object_basic.py
index ced486ad..00cb7f62 100644
--- a/examples/object_basic.py
+++ b/examples/object_basic.py
@@ -36,9 +36,9 @@
 
 # 获取Object的metadata
 object_meta = bucket.get_object_meta('你的对象名')
-print('last modified: ' + object_meta.last_modified)
+print('last modified: ' + str(object_meta.last_modified))
 print('etag: ' + object_meta.etag)
-print('size: ' + object_meta.content_length)
+print('size: ' + str(object_meta.content_length))
 
 # 下载到本地文件
 bucket.get_object_to_file('motto.txt', '本地文件名.txt')
diff --git a/oss2/xml_utils.py b/oss2/xml_utils.py
index 292e0d8f..d4c44e12 100644
--- a/oss2/xml_utils.py
+++ b/oss2/xml_utils.py
@@ -389,6 +389,8 @@ def parse_lifecycle_expiration(expiration_node):
         expiration.days = _find_int(expiration_node, 'Days')
     elif expiration_node.find('Date') is not None:
         expiration.date = iso8601_to_date(_find_tag(expiration_node, 'Date'))
+    elif expiration_node.find('CreatedBeforeDate') is not None:
+        expiration.created_before_date = iso8601_to_date(_find_tag(expiration_node, 'CreatedBeforeDate'))
 
     return expiration