Add date to iso string

src/js.rs

@@ -376,7 +376,16 @@ extern {
 #[wasm_bindgen]
 extern {
     pub type Date;
-    
+
+    /// The toISOString() method returns a string in simplified extended ISO format (ISO
+    /// 8601), which is always 24 or 27 characters long (YYYY-MM-DDTHH:mm:ss.sssZ or
+    /// ±YYYYYY-MM-DDTHH:mm:ss.sssZ, respectively). The timezone is always zero UTC offset, 
+    /// as denoted by the suffix "Z"
+    /// 
+    /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toISOString
+    #[wasm_bindgen(method, js_name = toISOString)]
+    pub fn to_iso_string(this: &Date) -> JsString;
+
     /// The toJSON() method returns a string representation of the Date object.
     /// 
     /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toJSON

tests/all/js_globals/Date.rs

@@ -2,6 +2,34 @@
 
 use super::project;
 
+#[test]
+fn to_iso_string() {
+    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, JsString};
+
+            #[wasm_bindgen]
+            pub fn to_iso_string(this: &Date) -> JsString {
+                this.to_iso_string()
+            }
+        "#)
+        .file("test.ts", r#"
+            import * as assert from "assert";
+            import * as wasm from "./out";
+
+            export function test() {
+                let date = new Date('05 October 2011 14:48 UTC');
+
+                assert.equal(wasm.to_iso_string(date), '2011-10-05T14:48:00.000Z');
+            }
+        "#)
+        .test()
+}
+
 #[test]
 fn to_json() {
     project()