Modified the certificate details viewers to include the timezone in the certificates validity dates.

chrome/browser/ui/webui/certificate_viewer_webui.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/webui/certificate_viewer_webui.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/i18n/time_formatting.h"
 #include "base/json/json_writer.h"
@@ skipping 329 matching lines @@
 
   node_details->Set("children", cert_sub_fields = new base::ListValue());
   cert_sub_fields->Append(node_details = new base::DictionaryValue());
   node_details->SetString("label",
       l10n_util::GetStringUTF8(IDS_CERT_DETAILS_NOT_BEFORE));
   cert_sub_fields->Append(alt_node_details = new base::DictionaryValue());
   alt_node_details->SetString("label",
       l10n_util::GetStringUTF8(IDS_CERT_DETAILS_NOT_AFTER));
   base::Time issued, expires;
   if (x509_certificate_model::GetTimes(cert, &issued, &expires)) {
+    //The object Time internally save the time in UTC timezone.

[jww, 2014/05/27 17:25:34]

Please add a space before the comment per Chromium code style. Also, please
correct "save" to "saves". I'd also add some explanation about "this is why the
(UTC) string is concatenated."

     node_details->SetString("payload.val",
-        base::UTF16ToUTF8(base::TimeFormatShortDateAndTime(issued)));
+        base::UTF16ToUTF8(base::TimeFormatShortDateAndTime(issued)) + " (UTC)");

[jww, 2014/05/27 17:25:34]

This should probably be internationalized.

     alt_node_details->SetString("payload.val",
-        base::UTF16ToUTF8(base::TimeFormatShortDateAndTime(expires)));
+        base::UTF16ToUTF8(base::TimeFormatShortDateAndTime(expires)) + " (UTC)");

[jww, 2014/05/27 17:25:34]

See above comment on 352.

   }
 
   cert_fields->Append(node_details = new base::DictionaryValue());
   node_details->SetString("label",
       l10n_util::GetStringUTF8(IDS_CERT_DETAILS_SUBJECT));
   node_details->SetString("payload.val",
       x509_certificate_model::GetSubjectName(cert));
 
   // Subject key information.
   cert_fields->Append(node_details = new base::DictionaryValue());
@@ skipping 70 matching lines @@
     const base::ListValue* args) const {
   int cert_index;
   double val;
   if (!(args->GetDouble(0, &val)))
     return -1;
   cert_index = static_cast<int>(val);
   if (cert_index < 0 || cert_index >= static_cast<int>(cert_chain_.size()))
     return -1;
   return cert_index;
 }