diff --git a/site/try/add_time_stamp.py b/site/try/add_time_stamp.py
new file mode 100644
index 00000000000..adc0612beeb
--- /dev/null
+++ b/site/try/add_time_stamp.py
@@ -0,0 +1,22 @@
+#!/usr/bin/env python
+# Copyright (c) 2014, 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.
+
+import datetime
+import sys
+
+def Main():
+  (_, input_file_name, output_file_name) = sys.argv
+  if not input_file_name or not output_file_name:
+    raise Exception('Missing argument')
+
+  timestamp = str(datetime.datetime.now())
+
+  with open(input_file_name, 'r') as input_file:
+    with open(output_file_name, 'w') as output_file:
+      output_file.write(input_file.read().replace('@@TIMESTAMP@@', timestamp))
+
+
+if __name__ == '__main__':
+  sys.exit(Main())
diff --git a/site/try/build_try.gyp b/site/try/build_try.gyp
index 09fec198720..c966ce1f754 100644
--- a/site/try/build_try.gyp
+++ b/site/try/build_try.gyp
@@ -12,6 +12,24 @@
         # Concern: there should really be a dependency on
         # ../../dart.gyp:create_sdk, but this is reported as a cycle by GYP.
       ],
+      'variables': {
+        'try_dart_static_files': [
+          'index.html',
+          'dartlang-style.css',
+          'iframe.html',
+          'iframe.js',
+          'dart-icon.png',
+          'dart-iphone5.png',
+
+          '../../third_party/font-awesome/font-awesome-4.0.3/'
+          'fonts/fontawesome-webfont.woff',
+
+          '../../sdk/lib/_internal/dartdoc/static/favicon.ico',
+
+          '<(SHARED_INTERMEDIATE_DIR)/leap.dart.js',
+          '<(SHARED_INTERMEDIATE_DIR)/sdk.json',
+        ],
+      },
       'actions': [
         {
           'action_name': 'sdk_json',
@@ -62,6 +80,26 @@
             '-o<(SHARED_INTERMEDIATE_DIR)/leap.dart.js',
           ],
         },
+        {
+          'action_name': 'nossl_appcache',
+          'message': 'Creating nossl.appcache',
+          'inputs': [
+            'add_time_stamp.py',
+            'nossl.appcache',
+            '<@(try_dart_static_files)',
+          ],
+          'outputs': [
+            '<(SHARED_INTERMEDIATE_DIR)/nossl.appcache',
+          ],
+          # Try Dart! uses AppCache. Cached files are only validated when the
+          # manifest changes (not its timestamp, but its actual contents).
+          'action': [
+            'python',
+            'add_time_stamp.py',
+            'nossl.appcache',
+            '<(SHARED_INTERMEDIATE_DIR)/nossl.appcache',
+          ],
+        },
       ],
       'copies': [
         {
@@ -70,22 +108,8 @@
           # List of files to be copied (creates implicit build dependencies).
           'files': [
             'app.yaml',
-
-            'nossl.appcache',
-            'index.html',
-            'dartlang-style.css',
-            'iframe.html',
-            'iframe.js',
-            'dart-icon.png',
-            'dart-iphone5.png',
-
-            '../../third_party/font-awesome/font-awesome-4.0.3/'
-            'fonts/fontawesome-webfont.woff',
-
-            '../../sdk/lib/_internal/dartdoc/static/favicon.ico',
-
-            '<(SHARED_INTERMEDIATE_DIR)/leap.dart.js',
-            '<(SHARED_INTERMEDIATE_DIR)/sdk.json',
+            '<@(try_dart_static_files)',
+            '<(SHARED_INTERMEDIATE_DIR)/nossl.appcache',
           ],
         },
       ],
diff --git a/site/try/nossl.appcache b/site/try/nossl.appcache
index d7de0a87917..d5218a3bf41 100644
--- a/site/try/nossl.appcache
+++ b/site/try/nossl.appcache
@@ -3,7 +3,7 @@ CACHE MANIFEST
 # 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.
 
-# Version 7.1 <-- CHANGE THIS when you have a new version
+# @@TIMESTAMP@@
 
 CACHE:
 index.html