Fix typo in Date.toString.

runtime/lib/date.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.
 
 class TimeZoneImplementation implements TimeZone {
   const TimeZoneImplementation.utc() : isUtc = true;
   TimeZoneImplementation.local() : isUtc = false {}
 
   bool operator ==(Object other) {
@@ skipping 201 matching lines @@
     String fourDigits(int n) {
       int absN = n.abs();
       String sign = n < 0 ? "-" : "";
       if (absN >= 1000) return "$n";
       if (absN >= 100) return "${sign}0$absN";
       if (absN >= 10) return "${sign}00$absN";
       if (absN >= 1) return "${sign}000$absN";
     }
     String threeDigits(int n) {
       if (n >= 100) return "${n}";
-      if (n > 10) return "0${n}";
+      if (n >= 10) return "0${n}";
       return "00${n}";
     }
     String twoDigits(int n) {
       if (n >= 10) return "${n}";
       return "0${n}";
     }
 
     String y = fourDigits(year);
     String m = twoDigits(month);
     String d = twoDigits(day);
@@ skipping 183 matching lines @@
 
   static int getHours_(int secondsSinceEpoch, bool isUtc)
       native "DateNatives_getHours";
 
   static int getMinutes_(int secondsSinceEpoch, bool isUtc)
       native "DateNatives_getMinutes";
 
   static int getSeconds_(int secondsSinceEpoch, bool isUtc)
       native "DateNatives_getSeconds";
 }