diff --git a/lodash/lodash-tests.ts b/lodash/lodash-tests.ts
index 9cf772cab..2398b8d43 100644
--- a/lodash/lodash-tests.ts
+++ b/lodash/lodash-tests.ts
@@ -5444,17 +5444,34 @@ module TestIsBoolean {
 }
 
 // _.isDate
-result = <boolean>_.isDate(any);
-result = <boolean>_(42).isDate();
-result = <boolean>_<any>([]).isDate();
-result = <boolean>_({}).isDate();
-{
-  let value: Date|string = "foo";
-  if (_.isDate(value)) {
-    value.toTimeString();
-  } else {
-    value.charAt(0);
-  }
+module TestIsBoolean {
+    {
+        let value: number|Date;
+
+        if (_.isDate(value)) {
+            let result: Date = value;
+        }
+        else {
+            let result: number = value;
+        }
+    }
+
+    {
+        let result: boolean;
+
+        result = _.isDate(any);
+        result = _(42).isDate();
+        result = _<any>([]).isDate();
+        result = _({}).isDate();
+    }
+
+    {
+        let result: _.LoDashExplicitWrapper<boolean>;
+
+        result = _(42).chain().isDate();
+        result = _<any>([]).chain().isDate();
+        result = _({}).chain().isDate();
+    }
 }
 
 // _.isElement
diff --git a/lodash/lodash.d.ts b/lodash/lodash.d.ts
index 81d78b1bc..64b4da950 100644
--- a/lodash/lodash.d.ts
+++ b/lodash/lodash.d.ts
@@ -9285,8 +9285,9 @@ declare module _ {
         /**
          * Checks if value is classified as a Date object.
          * @param value The value to check.
+         *
          * @return Returns true if value is correctly classified, else false.
-         **/
+         */
         isDate(value?: any): value is Date;
     }
 
@@ -9297,6 +9298,13 @@ declare module _ {
         isDate(): boolean;
     }
 
+    interface LoDashExplicitWrapperBase<T, TWrapper> {
+        /**
+         * @see _.isDate
+         */
+        isDate(): LoDashExplicitWrapper<boolean>;
+    }
+
     //_.isElement
     interface LoDashStatic {
         /**