diff --git a/lib/errors.js b/lib/errors.js
index c370b22c..f838c739 100644
--- a/lib/errors.js
+++ b/lib/errors.js
@@ -177,7 +177,7 @@ const byErrorCode = Object.assign(Object.create(null), {
 	H9360: {
 		isClient: true,
 		code: INVALID_REQUEST,
-		message: 'journeys search: error in a data field',
+		message: 'journeys search: invalid date/time',
 		statusCode: 400
 	},
 	H9380: {