diff --git a/osclib/core.py b/osclib/core.py
index f05e06bd..1e08b9c0 100644
--- a/osclib/core.py
+++ b/osclib/core.py
@@ -1,6 +1,7 @@
 from collections import namedtuple
 from collections import OrderedDict
 from datetime import datetime
+from datetime import timezone
 from dateutil.parser import parse as date_parse
 import re
 import socket
@@ -526,6 +527,14 @@ def project_meta_revision(apiurl, project):
         apiurl, project, '_project', None, format='xml', meta=True))
     return int(root.find('logentry').get('revision'))
 
+def package_source_changed(apiurl, project, package):
+    url = makeurl(apiurl, ['source', project, package, '_history'], {'limit': 1})
+    root = ETL.parse(http_GET(url)).getroot()
+    return datetime.fromtimestamp(int(root.find('revision/time').text), timezone.utc).replace(tzinfo=None)
+
+def package_source_age(apiurl, project, package):
+    return datetime.utcnow() - package_source_changed(apiurl, project, package)
+
 def entity_exists(apiurl, project, package=None):
     try:
         http_GET(makeurl(apiurl, list(filter(None, ['source', project, package])) + ['_meta']))