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

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;
+}