Support non-zero minutes in the timestamp offset for JSON.
diff --git a/tests/bindings/lua/test.proto b/tests/bindings/lua/test.proto
index 6b45350..4c3b64e 100644
--- a/tests/bindings/lua/test.proto
+++ b/tests/bindings/lua/test.proto
@@ -1,6 +1,8 @@
 
 syntax = "proto2";
 
+import "google/protobuf/timestamp.proto";
+
 package upb_test;
 
 message MapTest {
@@ -26,3 +28,7 @@
 message TestLargeFieldNumber {
   optional int32 i32 = 456214797;
 }
+
+message TestTimestamp {
+  optional google.protobuf.Timestamp ts = 1;
+}