Use datetime for key expiration

1 files changed, 4 insertions, 5 deletions

diff --git a/src/leap/keymanager/validation.py b/src/leap/keymanager/validation.py
index 7d68966e..cf5b4a83 100644
--- a/src/leap/keymanager/validation.py
+++ b/src/leap/keymanager/validation.py
@@ -80,11 +80,10 @@ def can_upgrade(new_key, old_key):
         return True
 
     # Expired key and higher validation level
-    if old_key.expiry_date:
-        old_expiry_date = datetime.fromtimestamp(int(old_key.expiry_date))
-        if (old_expiry_date < datetime.now() and
-                new_key.validation >= old_key.validation):
-            return True
+    if (old_key.expiry_date is not None and
+            old_key.expiry_date < datetime.now() and
+            new_key.validation >= old_key.validation):
+        return True
 
     # No expiration date and higher validation level
     elif new_key.validation >= old_key.validation: