From b7fcf161d54c8362e93fec6803349fadd39ec8b8 Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <drosen@microsoft.com>
Date: Tue, 18 Aug 2015 13:14:19 -0700
Subject: [PATCH] Added the '[Symbol.toPrimitive]' method to the 'Date'
 interface.

---
 src/lib/es6.d.ts | 28 ++++++++++++++++++++++++++--
 1 file changed, 26 insertions(+), 2 deletions(-)

diff --git a/src/lib/es6.d.ts b/src/lib/es6.d.ts
index 934aa9d0762..d1efb7ce6dc 100644
--- a/src/lib/es6.d.ts
+++ b/src/lib/es6.d.ts
@@ -87,8 +87,8 @@ interface SymbolConstructor {
     split: symbol;
 
     /** 
-      * A method that converts an object to a corresponding primitive value.Called by the ToPrimitive
-      * abstract operation.
+      * A method that converts an object to a corresponding primitive value.
+      * Called by the ToPrimitive abstract operation.
       */
     toPrimitive: symbol;
 
@@ -622,6 +622,30 @@ interface Math {
     [Symbol.toStringTag]: string;
 }
 
+interface Date {
+    /**
+     * Converts a Date object to a string.
+     */
+    [Symbol.toPrimitive](hint: "default"): string;
+    /**
+     * Converts a Date object to a string.
+     */
+    [Symbol.toPrimitive](hint: "string"): string;
+    /**
+     * Converts a Date object to a number.
+     */
+    [Symbol.toPrimitive](hint: "number"): number;
+    /**
+     * Converts a Date object to a string or number.
+     *
+     * @param hint The strings "number", "string", or "default" to specify what primitive to return.
+     *
+     * @throws {TypeError} If 'hint' was given something other than "number", "string", or "default".
+     * @returns A number if 'hint' was "number", a string if 'hint' was "string" or "default".
+     */
+    [Symbol.toPrimitive](hint: string): string | number;
+}
+
 interface RegExp {
     /** 
       * Matches a string with a regular expression, and returns an array containing the results of