Add date constructor

examples/closures/src/lib.rs

@@ -3,6 +3,8 @@
 extern crate wasm_bindgen;
 
 use wasm_bindgen::prelude::*;
+use wasm_bindgen::js::Date;
+use wasm_bindgen::js::JsString;
 
 #[wasm_bindgen]
 extern {
@@ -16,13 +18,6 @@ extern {
     #[wasm_bindgen(js_name = setInterval)]
     fn set_interval(cb: &Closure<FnMut()>, delay: u32) -> f64;
 
-    // Bindings for JS `Date` so we can update our local timer
-    type Date;
-    #[wasm_bindgen(constructor)]
-    fn new() -> Date;
-    #[wasm_bindgen(method, js_name = toLocaleString)]
-    fn to_locale_string(this: &Date) -> String;
-
     // Bindings for `document` and various methods of updating HTML elements.
     // Like with the `dom` example these'll ideally be upstream in a generated
     // crate one day but for now we manually define them.
@@ -57,7 +52,11 @@ pub fn run() {
     update_time();
     fn update_time() {
         document.get_element_by_id("current-time")
-            .set_inner_html(&Date::new().to_locale_string());
+            .set_inner_html(
+                &String::from(
+                    Date::new()
+                    .to_locale_string(
+                        JsString::from("en-GB"), JsValue::undefined())));
     }
 
     // We also want to count the number of times that our green square has been

src/js.rs

@@ -377,6 +377,14 @@ extern {
 extern {
     pub type Date;
 
+    /// Creates a JavaScript Date instance that represents 
+    /// a single moment in time. Date objects are based on a time value that is 
+    /// the number of milliseconds since 1 January 1970 UTC.
+    /// 
+    /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date
+    #[wasm_bindgen(constructor)]
+    pub fn new() -> Date;
+
     /// The toDateString() method returns the date portion of a Date object
     /// in human readable form in American English.
     /// 

tests/all/js_globals/Date.rs

@@ -2,6 +2,32 @@
 
 use super::project;
 
+#[test]
+fn new() {
+    project()
+        .file("src/lib.rs", r#"
+            #![feature(proc_macro, wasm_custom_section)]
+
+            extern crate wasm_bindgen;
+            use wasm_bindgen::prelude::*;
+            use wasm_bindgen::js::Date;
+
+            #[wasm_bindgen]
+            pub fn new_date() -> Date {
+                Date::new()
+            }
+        "#)
+        .file("test.ts", r#"
+            import * as assert from "assert";
+            import * as wasm from "./out";
+
+            export function test() {
+                assert.equal(typeof wasm.new_date(), "object");
+            }
+        "#)
+        .test()
+}
+
 #[test]
 fn to_date_string() {
     project()