diff --git a/src/process/validation/i18n/en.ts b/src/process/validation/i18n/en.ts
index f9174040..ede84533 100644
--- a/src/process/validation/i18n/en.ts
+++ b/src/process/validation/i18n/en.ts
@@ -34,5 +34,6 @@ export const EN_ERRORS = {
     captchaTokenValidation: 'ReCAPTCHA: Token validation error',
     captchaTokenNotSpecified: 'ReCAPTCHA: Token is not specified in submission',
     captchaFailure: 'ReCaptcha: Response token not found',
-    time: '{{field}} is not a valid time.',
+    time: '{{field}} is not a valid time',
+    invalidDate: '{{field}} is not a valid date',
 };