diff --git a/types/bootstrap.timepicker/index.d.ts b/types/bootstrap.timepicker/index.d.ts
index 384d550e57..49283cfde7 100644
--- a/types/bootstrap.timepicker/index.d.ts
+++ b/types/bootstrap.timepicker/index.d.ts
@@ -1,13 +1,13 @@
 // Type definitions for bootstrap.timepicker
 // Project: https://github.com/jdewit/bootstrap-timepicker
-// Definitions by: derikwhittaker <https://github.com/derikwhittaker>
+// Definitions by: derikwhittaker <https://github.com/derikwhittaker>, Heather Booker <https://github.com/heatherbooker>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.3
 
 /// <reference types="jquery"/>
 
 interface TimepickerOptions {
-    defaultTime?: string|boolean;
+    defaultTime?: string|boolean|Date;
     disableFocus?: boolean;
     disableMousewheel?: boolean;
     explicitMode?: boolean;