Add date to locale string

src/js.rs

@@ -376,7 +376,19 @@ extern {
 #[wasm_bindgen]
 extern {
     pub type Date;
-    
+
+    /// The toLocaleString() method returns a string with a language sensitive 
+    /// representation of this date. The new locales and options arguments 
+    /// let applications specify the language whose formatting conventions 
+    /// should be used and customize the behavior of the function. 
+    /// In older implementations, which ignore the locales 
+    /// and options arguments, the locale used and the form of the string 
+    /// returned are entirely implementation dependent.
+    ///
+    /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toLocaleString
+    #[wasm_bindgen(method, js_name = toLocaleString)]
+    pub fn to_locale_string(this: &Date, locale: JsString, options: JsValue) -> JsString;
+
     /// The toLocaleTimeString() method returns a string with a language sensitive
     /// representation of the time portion of this date. The new locales and options
     /// arguments let applications specify the language whose formatting conventions should be

tests/all/js_globals/Date.rs

@@ -2,6 +2,34 @@
 
 use super::project;
 
+#[test]
+fn to_locale_string() {
+    project()
+        .file("src/lib.rs", r#"
+            #![feature(proc_macro, wasm_custom_section)]
+
+            extern crate wasm_bindgen;
+            use JsValue;
+            use wasm_bindgen::prelude::*;
+            use wasm_bindgen::js::{Date, JsString};
+
+            #[wasm_bindgen]
+            pub fn to_locale_string(this: &Date, locale: JsString, options: JsValue) -> JsString {
+                this.to_locale_string(locale, options)
+            }
+        "#)
+        .file("test.ts", r#"
+            import * as assert from "assert";
+            import * as wasm from "./out";
+
+            export function test() {
+                let date = new Date(Date.UTC(2012, 11, 20, 3, 0, 0));
+                assert.equal(wasm.to_locale_string(date, 'en-GB', { timeZone: 'UTC' }), "12/20/2012, 3:00:00 AM");
+            }
+        "#)
+        .test()
+}
+
 #[test]
 fn to_locale_time_string() {
     project()