partly fix date format dartbug.com/15811. this 0 pads.

pkg/intl/lib/src/date_format_field.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.
 
 part of intl;
 
 /**
  * This is a private class internal to DateFormat which is used for formatting
  * particular fields in a template. e.g. if the format is hh:mm:ss then the
  * fields would be "hh", ":", "mm", ":", and "ss". Each type of field knows
@@ skipping 177 matching lines @@
     return width >= 4 ? symbols.ERANAMES[era] :
                         symbols.ERAS[era];
   }
 
   formatYear(DateTime date) {
     // TODO(alanknight): Proper handling of years <= 0
     var year = date.year;
     if (year < 0) {
       year = -year;
     }
-    return width == 2 ? padTo(2, year % 100) : year.toString();
+    return width == 2 ? padTo(2, year % 100) : padTo(width, year);
   }
 
   /**
    * We are given [input] as a stream from which we want to read a date. We
    * can't dynamically build up a date, so we are given a list [dateFields] of
    * the constructor arguments and an [position] at which to set it
    * (year,month,day,hour,minute,second,fractionalSecond)
    * then after all parsing is done we construct a date from the arguments.
    * This method handles reading any of the numeric fields. The [offset]
    * argument allows us to compensate for zero-based versus one-based values.
@@ skipping 217 matching lines @@
     var basicString = toBePrinted.toString();
     if (basicString.length >= width) return basicString;
     var buffer = new StringBuffer();
     for (var i = 0; i < width - basicString.length; i++) {
       buffer.write('0');
     }
     buffer.write(basicString);
     return buffer.toString();
   }
 }