Parsing dates with format that's just month or day will fail on certain days

pkg/intl/lib/date_format_helpers.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.
 
 /**
  * A class for holding onto the data for a date so that it can be built
  * up incrementally.
  */
 class _DateBuilder {
-  int year = 0,
-      month = 0,
-      day = 0,
+  // Default the date values to the EPOCH so that there's a valid date
+  // in case the format doesn't set them.
+  int year = 1970,
+      month = 1,
+      day = 1,
       hour = 0,
       minute = 0,
       second = 0,
       fractionalSecond = 0;
   bool pm = false;
   bool utc = false;
 
   // Functions that exist just to be closurized so we can pass them to a general
   // method.
   void setYear(x) { year = x; }
   void setMonth(x) { month = x; }
   void setDay(x) { day = x; }
   void setHour(x) { hour = x; }
   void setMinute(x) { minute = x; }
   void setSecond(x) { second = x; }
   void setFractionalSecond(x) { fractionalSecond = x; }
 
   /**
    * Return a date built using our values. If no date portion is set,
-   * use today's date, as otherwise the constructor will fail.
+   * use the "Epoch" of January 1, 1970.
    */
   Date asDate() {

[Anton Muhin, 2012/08/30 17:52:11]

nit: you may prefer arrow syntax now.

-    if (year == 0 || month == 0 || day == 0) {
-      var today = new Date.now();
-      if (year == 0) year = today.year;
-      if (month == 0) month = today.month;
-      if (day == 0) day = today.day;
-    }
-
     // TODO(alanknight): Validate the date, especially for things which
     // can crash the VM, e.g. large month values.
     return new Date(
         year,
         month,
         day,
         pm ? hour + 12 : hour,
         minute,
         second,
         fractionalSecond,
@@ skipping 74 matching lines @@
    * can see and then return the corresponding integer. Advance the stream.
    */
   var digitMatcher = const RegExp(@'\d+');
   int nextInteger() {
     var string = digitMatcher.stringMatch(rest());
     if (string == null || string.isEmpty()) return null;
     read(string.length);
     return parseInt(string);
   }
 }