Fix typo in Date.toString.

frog/lib/date_implementation.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.
 
 // TODO(jmesserly): the native class should be the real JS Date.
 // TODO(jimhug): Making the date value non-lazy might be a good path there.
 class DateImplementation implements Date {
   final int value;
   final TimeZone timeZone;
 
@@ skipping 185 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 68 matching lines @@
     return isUtc == other.isUtc;
   }
 
   String toString() {
     if (isUtc) return "TimeZone (UTC)";
     return "TimeZone (Local)";
   }
 
   final bool isUtc;
 }