Change IllegalArgumentException to ArgumentError.

lib/coreimpl/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.
@@ skipping 32 matching lines @@
       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.
       bool isUtc = (match[8] !== null) && (match[8] != "");
       int millisecondsSinceEpoch = _brokenDownDateToMillisecondsSinceEpoch(
           years, month, day, hour, minute, second, millisecond, isUtc);
       if (millisecondsSinceEpoch === null) {
-        throw new IllegalArgumentException(formattedString);
+        throw new ArgumentError(formattedString);
       }
       if (addOneMillisecond) millisecondsSinceEpoch++;
       return new Date.fromMillisecondsSinceEpoch(millisecondsSinceEpoch, isUtc);
     } else {
-      throw new IllegalArgumentException(formattedString);
+      throw new ArgumentError(formattedString);
     }
   }
 
   static const int _MAX_MILLISECONDS_SINCE_EPOCH = 8640000000000000;
 
   DateImplementation.fromMillisecondsSinceEpoch(this.millisecondsSinceEpoch,
                                                 this.isUtc) {
     if (millisecondsSinceEpoch.abs() > _MAX_MILLISECONDS_SINCE_EPOCH) {
-      throw new IllegalArgumentException(millisecondsSinceEpoch);
+      throw new ArgumentError(millisecondsSinceEpoch);
     }
-    if (isUtc === null) throw new IllegalArgumentException(isUtc);
+    if (isUtc === null) throw new ArgumentError(isUtc);
   }
 
   bool operator ==(other) {
     if (!(other is Date)) return false;
     return (millisecondsSinceEpoch == other.millisecondsSinceEpoch);
   }
 
   bool operator <(Date other)
       => millisecondsSinceEpoch < other.millisecondsSinceEpoch;
 
@@ skipping 96 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;
 }