diff --git a/interoperability/ocss/time.go b/interoperability/ocss/time.go
index 6dc8cdc..7cb077f 100644
--- a/interoperability/ocss/time.go
+++ b/interoperability/ocss/time.go
@@ -55,3 +55,10 @@ func (t *OCSSTime) UnmarshalBSONValue(bt bsontype.Type, b []byte) error {
 	*t = OCSSTime(datetime)
 	return nil
 }
+
+func (t *OCSSTime) Format(format string) string {
+	if format == "" {
+		return ""
+	}
+	return t.ToTime().Format(format)
+}