Removes dartc reliance on its own libraries, now can be targeted at any implementation's libraries

compiler/lib/implementation/date_implementation.js

-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-// Dart core library.
-
-function date$validateValue(value) {
-  if (isNaN(value)) {
-    // TODO(floitsch): Use real exception object.
-    throw Error("Invalid Date");
-  }
-  return value;
-}
-
-function native_DateImplementation__valueFromDecomposed(
-    years, month, day, hours, minutes, seconds, milliseconds, isUtc) {
-  // JavaScript has 0-based months.
-  var jsMonth = month - 1;
-  var value = isUtc ?
-              Date.UTC(years, jsMonth, day,
-                       hours, minutes, seconds, milliseconds) :
-              new Date(years, jsMonth, day,
-                       hours, minutes, seconds, milliseconds).valueOf();
-  return date$validateValue(value);
-}
-
-function native_DateImplementation__valueFromString(str) {
-  return date$validateValue(Date.parse(str));
-}
-
-function native_DateImplementation__now() {
-  return new Date().valueOf();
-}
-
-function date$dateFrom(dartDate, value) {
-  // Lazily keep a JS Date stored in the dart object.
-  var date = dartDate.date;
-  if (!date) {
-    date = new Date(value);
-    dartDate.date = date;
-  }
-  return date;
-}
-
-function native_DateImplementation__getYear(value, isUtc) {
-  var date = date$dateFrom(this, value);
-  return isUtc ? date.getUTCFullYear() : date.getFullYear();
-}
-
-function native_DateImplementation__getMonth(value, isUtc) {
-  var date = date$dateFrom(this, value);
-  var jsMonth = isUtc ? date.getUTCMonth() : date.getMonth();
-  // JavaScript has 0-based months.
-  return jsMonth + 1;
-}
-
-function native_DateImplementation__getDay(value, isUtc) {
-  var date = date$dateFrom(this, value);
-  return isUtc ? date.getUTCDate() : date.getDate();
-}
-
-function native_DateImplementation__getHours(value, isUtc) {
-  var date = date$dateFrom(this, value);
-  return isUtc ? date.getUTCHours() : date.getHours();
-}
-
-function native_DateImplementation__getMinutes(value, isUtc) {
-  var date = date$dateFrom(this, value);
-  return isUtc ? date.getUTCMinutes() : date.getMinutes();
-}
-
-function native_DateImplementation__getSeconds(value, isUtc) {
-  var date = date$dateFrom(this, value);
-  return isUtc ? date.getUTCSeconds() : date.getSeconds();
-}
-
-function native_DateImplementation__getMilliseconds(value, isUtc) {
-  var date = date$dateFrom(this, value);
-  return isUtc ? date.getUTCMilliseconds() : date.getMilliseconds();
-}