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

compiler/lib/implementation/date_implementation.dart

-// 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.
-
-// JavaScript implementation of DateImplementation.
-class DateImplementation implements Date {
-  factory DateImplementation(int years,
-                             int month,
-                             int day,
-                             int hours,
-                             int minutes,
-                             int seconds,
-                             int milliseconds) {
-    return new DateImplementation.withTimeZone(
-        years, month, day,
-        hours, minutes, seconds, milliseconds,
-        new TimeZoneImplementation.local());
-  }
-
-  DateImplementation.withTimeZone(int years,
-                                  int month,
-                                  int day,
-                                  int hours,
-                                  int minutes,
-                                  int seconds,
-                                  int milliseconds,
-                                  TimeZone timeZone)
-      : this.timeZone = timeZone,
-        value = _valueFromDecomposed(years, month, day,
-                                     hours, minutes, seconds, milliseconds,
-                                     timeZone.isUtc) {
-  }
-
-  DateImplementation.now()
-      : timeZone = new TimeZone.local(),
-        value = _now() {
-  }
-
-  DateImplementation.fromString(String formattedString)
-      : timeZone = new TimeZone.local(),
-        value = _valueFromString(formattedString) {
-  }
-
-  const DateImplementation.fromEpoch(int this.value, TimeZone this.timeZone);
-
-  bool operator ==(other) {
-    if (!(other is DateImplementation)) return false;
-    return (value == other.value) && (timeZone == other.timeZone);
-  }
-
-  int compareTo(Date other) {
-    return value.compareTo(other.value);
-  }
-
-  Date changeTimeZone(TimeZone targetTimeZone) {
-    if (targetTimeZone == null) {
-      targetTimeZone = new TimeZoneImplementation.local();
-    }
-    return new Date.fromEpoch(value, targetTimeZone);
-  }
-
-  int get year() {
-    return _getYear(value, isUtc());
-  }
-
-  int get month() {
-    return _getMonth(value, isUtc());
-  }
-
-  int get day() {
-    return _getDay(value, isUtc());
-  }
-
-  int get hours() {
-    return _getHours(value, isUtc());
-  }
-
-  int get minutes() {
-    return _getMinutes(value, isUtc());
-  }
-
-  int get seconds() {
-    return _getSeconds(value, isUtc());
-  }
-
-  int get milliseconds() {
-    return _getMilliseconds(value, isUtc());
-  }
-
-  int get weekday() {
-    final Date unixTimeStart =
-        new Date.withTimeZone(1970, 1, 1, 0, 0, 0, 0, timeZone);
-    int msSince1970 = this.difference(unixTimeStart).inMilliseconds;
-    // Adjust the milliseconds to avoid problems with summer-time.
-    if (hours < 2) {
-      msSince1970 += 2 * Duration.MILLISECONDS_PER_HOUR;
-    }
-    int daysSince1970 =
-        (msSince1970 / Duration.MILLISECONDS_PER_DAY).floor().toInt();
-    // 1970-1-1 was a Thursday.
-    return ((daysSince1970 + Date.THU) % Date.DAYS_IN_WEEK);
-  }
-
-  bool isLocalTime() {
-    return !timeZone.isUtc;
-  }
-
-  bool isUtc() {
-    return timeZone.isUtc;
-  }
-
-  String toString() {
-    String threeDigits(int n) {
-      if (n >= 100) return "${n}";
-      if (n > 10) return "0${n}";
-      return "00${n}";
-    }
-    String twoDigits(int n) {
-      if (n >= 10) return "${n}";
-      return "0${n}";
-    }
-
-    String m = twoDigits(month);
-    String d = twoDigits(day);
-    String h = twoDigits(hours);
-    String min = twoDigits(minutes);
-    String sec = twoDigits(seconds);
-    String ms = threeDigits(milliseconds);
-    if (timeZone.isUtc) {
-      return "$year-$m-$d $h:$min:$sec.${ms}Z";
-    } else {
-      return "$year-$m-$d $h:$min:$sec.$ms";
-    }
-  }
-
-    // Adds the [duration] to this Date instance.
-  Date add(Duration duration) {
-    return new DateImplementation.fromEpoch(value + duration.inMilliseconds,
-                                            timeZone);
-  }
-
-  // Subtracts the [duration] from this Date instance.
-  Date subtract(Duration duration) {
-    return new DateImplementation.fromEpoch(value - duration.inMilliseconds,
-                                            timeZone);
-  }
-
-  // Returns a [Duration] with the difference of [this] and [other].
-  Duration difference(Date other) {
-    return new Duration(milliseconds: value - other.value);
-  }
-
-  final int value;
-  final TimeZoneImplementation timeZone;
-
-  static int _valueFromDecomposed(int years, int month, int day,
-                                  int hours, int minutes, int seconds,
-                                  int milliseconds, bool isUtc) native;
-  static int _valueFromString(String str) native;
-  static int _now() native;
-  int _getYear(int value, bool isUtc) native;
-  int _getMonth(int value, bool isUtc) native;
-  int _getDay(int value, bool isUtc) native;
-  int _getHours(int value, bool isUtc) native;
-  int _getMinutes(int value, bool isUtc) native;
-  int _getSeconds(int value, bool isUtc) native;
-  int _getMilliseconds(int value, bool isUtc) native;
-}