Use JS Date().toLocaleDateString() to format date in header.

chrome/renderer/printing/print_web_view_helper.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/renderer/printing/print_web_view_helper.h"
 
 #include <string>
 
 #include "base/auto_reset.h"
 #include "base/command_line.h"
@@ skipping 1465 matching lines @@
     }
 
     settings.params.print_to_pdf = IsPrintToPdfRequested(*job_settings);
     UpdateFrameMarginsCssInfo(*job_settings);
     settings.params.print_scaling_option = GetPrintScalingOption(
         source_is_html, *job_settings, settings.params);
 
     // Header/Footer: Set |header_footer_info_|.
     if (settings.params.display_header_footer) {
       header_footer_info_.reset(new base::DictionaryValue());
-      header_footer_info_->SetString(kSettingHeaderFooterDate,
-                                     settings.params.date);
+      header_footer_info_->SetDouble(kSettingHeaderFooterDate,
+                                     base::Time::Now().ToJsTime());
       header_footer_info_->SetString(kSettingHeaderFooterURL,
                                      settings.params.url);
       header_footer_info_->SetString(kSettingHeaderFooterTitle,
                                      settings.params.title);
     }
   }
 
   print_pages_params_.reset(new PrintMsg_PrintPages_Params(settings));
   Send(new PrintHostMsg_DidGetDocumentCookie(routing_id(),
                                              settings.params.document_cookie));
@@ skipping 466 matching lines @@
 }
 
 void PrintWebViewHelper::PrintPreviewContext::ClearContext() {
   prep_frame_view_.reset();
   metafile_.reset();
   pages_to_render_.clear();
   error_ = PREVIEW_ERROR_NONE;
 }
 
 }  // namespace printing