Make FileStat have millisecond precisions, for linux, mac and android.

sdk/lib/io/file_system_entity.dart

 // Copyright (c) 2013, 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 dart.io;
 
 /**
  * The type of an entity on the file system, such as a file, directory, or link.
  *
  * These constants are used by the [FileSystemEntity] class
@@ skipping 86 matching lines @@
    * FileSystemEntityType.NOT_FOUND and the other fields invalid.
    */
   static FileStat statSync(String path) {
     // Trailing path is not supported on Windows.
     if (Platform.isWindows) {
       path = FileSystemEntity._trimTrailingPathSeparators(path);
     }
     var data = _statSync(path);
     if (data is OSError) return FileStat._notFound;
     return new FileStat._internal(
-        new DateTime.fromMillisecondsSinceEpoch(data[_CHANGED_TIME] * 1000),
-        new DateTime.fromMillisecondsSinceEpoch(data[_MODIFIED_TIME] * 1000),
-        new DateTime.fromMillisecondsSinceEpoch(data[_ACCESSED_TIME] * 1000),
+        new DateTime.fromMillisecondsSinceEpoch(data[_CHANGED_TIME]),
+        new DateTime.fromMillisecondsSinceEpoch(data[_MODIFIED_TIME]),
+        new DateTime.fromMillisecondsSinceEpoch(data[_ACCESSED_TIME]),
         FileSystemEntityType._lookup(data[_TYPE]),
         data[_MODE],
         data[_SIZE]);
   }
 
   /**
    * Asynchronously calls the operating system's stat() function on [path].
    * Returns a Future which completes with a [FileStat] object containing
    * the data returned by stat().
    * If the call fails, completes the future with a [FileStat] object with
    * .type set to FileSystemEntityType.NOT_FOUND and the other fields invalid.
    */
   static Future<FileStat> stat(String path) {
     // Trailing path is not supported on Windows.
     if (Platform.isWindows) {
       path = FileSystemEntity._trimTrailingPathSeparators(path);
     }
     return _IOService.dispatch(_FILE_STAT, [path]).then((response) {
       if (_isErrorResponse(response)) {
         return FileStat._notFound;
       }
       // Unwrap the real list from the "I'm not an error" wrapper.
       List data = response[1];
       return new FileStat._internal(
-          new DateTime.fromMillisecondsSinceEpoch(data[_CHANGED_TIME] * 1000),
-          new DateTime.fromMillisecondsSinceEpoch(data[_MODIFIED_TIME] * 1000),
-          new DateTime.fromMillisecondsSinceEpoch(data[_ACCESSED_TIME] * 1000),
+          new DateTime.fromMillisecondsSinceEpoch(data[_CHANGED_TIME]),
+          new DateTime.fromMillisecondsSinceEpoch(data[_MODIFIED_TIME]),
+          new DateTime.fromMillisecondsSinceEpoch(data[_ACCESSED_TIME]),
           FileSystemEntityType._lookup(data[_TYPE]),
           data[_MODE],
           data[_SIZE]);
     });
   }
 
   String toString() => """
 FileStat: type $type
           changed $changed
           modified $modified
@@ skipping 659 matching lines @@
     return buffer.toString();
   }
 }
 
 
 class _FileSystemWatcher {
   external static Stream<FileSystemEvent> watch(
       String path, int events, bool recursive);
   external static bool get isSupported;
 }