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--- a/ForgeTracker/forgetracker/tracker_main.py
+++ b/ForgeTracker/forgetracker/tracker_main.py
@@ -321,8 +321,8 @@
     @without_trailing_slash
     @expose()
     @validate(dict(
-            since=h.DateTimeConverter(if_empty=None),
-            until=h.DateTimeConverter(if_empty=None),
+            since=h.DateTimeConverter(if_empty=None, if_invalid=None),
+            until=h.DateTimeConverter(if_empty=None, if_invalid=None),
             offset=validators.Int(if_empty=None),
             limit=validators.Int(if_empty=None)))
     def feed(self, since=None, until=None, offset=None, limit=None):
@@ -661,8 +661,8 @@
     @without_trailing_slash
     @expose()
     @validate(dict(
-            since=h.DateTimeConverter(if_empty=None),
-            until=h.DateTimeConverter(if_empty=None),
+            since=h.DateTimeConverter(if_empty=None, if_invalid=None),
+            until=h.DateTimeConverter(if_empty=None, if_invalid=None),
             offset=validators.Int(if_empty=None),
             limit=validators.Int(if_empty=None)))
     def feed(self, since=None, until=None, offset=None, limit=None):