Deprecate Math object in corelib in favor of dart:math library.

corelib/src/implementation/date.dart

 // Copyright (c) 2012, 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.
 
 class DateImplementation implements Date {
   final int millisecondsSinceEpoch;
   final bool isUtc;
 
   factory DateImplementation.fromString(String formattedString) {
     // Read in (a subset of) ISO 8601.
     // Examples:
     //    - "2012-02-27 13:27:00"
     //    - "2012-02-27 13:27:00.423z"
     //    - "20120227 13:27:00"
     //    - "20120227T132700"
     //    - "20120227"
     //    - "2012-02-27T14Z"
     //    - "-123450101 00:00:00 Z"  // In the year -12345.
     final RegExp re = const RegExp(
         @'^([+-]?\d?\d\d\d\d)-?(\d\d)-?(\d\d)'  // The day part.
         @'(?:[ T](\d\d)(?::?(\d\d)(?::?(\d\d)(.\d{1,6})?)?)? ?([zZ])?)?$');
     Match match = re.firstMatch(formattedString);
     if (match !== null) {
       int parseIntOrZero(String matched) {
         // TODO(floitsch): we should not need to test against the empty string.
         if (matched === null || matched == "") return 0;
-        return Math.parseInt(matched);
+        return parseInt(matched);
       }
 
       double parseDoubleOrZero(String matched) {
         // TODO(floitsch): we should not need to test against the empty string.
         if (matched === null || matched == "") return 0.0;
-        return Math.parseDouble(matched);
+        return parseDouble(matched);
       }
 
-      int years = Math.parseInt(match[1]);
-      int month = Math.parseInt(match[2]);
-      int day = Math.parseInt(match[3]);
+      int years = parseInt(match[1]);
+      int month = parseInt(match[2]);
+      int day = parseInt(match[3]);
       int hour = parseIntOrZero(match[4]);
       int minute = parseIntOrZero(match[5]);
       int second = parseIntOrZero(match[6]);
       bool addOneMillisecond = false;
       int millisecond = (parseDoubleOrZero(match[7]) * 1000).round().toInt();
       if (millisecond == 1000) {
         addOneMillisecond = true;
         millisecond = 999;
       }
       // TODO(floitsch): we should not need to test against the empty string.
@@ skipping 126 matching lines @@
   external Duration get timeZoneOffset();
   external int get year();
   external int get month();
   external int get day();
   external int get hour();
   external int get minute();
   external int get second();
   external int get millisecond();
   external int get weekday();
 }