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

chrome/common/print_messages.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/common/print_messages.h"
 
 #include "base/basictypes.h"
 #include "base/strings/string16.h"
 #include "ui/gfx/size.h"
 
 PrintMsg_Print_Params::PrintMsg_Print_Params()
   : page_size(),
     content_size(),
     printable_area(),
     margin_top(0),
     margin_left(0),
     dpi(0),
     min_shrink(0),
     max_shrink(0),
     desired_dpi(0),
     document_cookie(0),
     selection_only(false),
     supports_alpha_blend(false),
     preview_ui_id(-1),
     preview_request_id(0),
     is_first_request(false),
     print_scaling_option(WebKit::WebPrintScalingOptionSourceSize),
     print_to_pdf(false),
     display_header_footer(false),
-    date(),
     title(),
     url(),
     should_print_backgrounds(false) {
 }
 
 PrintMsg_Print_Params::~PrintMsg_Print_Params() {}
 
 void PrintMsg_Print_Params::Reset() {
   page_size = gfx::Size();
   content_size = gfx::Size();
   printable_area = gfx::Rect();
   margin_top = 0;
   margin_left = 0;
   dpi = 0;
   min_shrink = 0;
   max_shrink = 0;
   desired_dpi = 0;
   document_cookie = 0;
   selection_only = false;
   supports_alpha_blend = false;
   preview_ui_id = -1;
   preview_request_id = 0;
   is_first_request = false;
   print_scaling_option = WebKit::WebPrintScalingOptionSourceSize;
   print_to_pdf = false;
   display_header_footer = false;
-  date = string16();
   title = string16();
   url = string16();
   should_print_backgrounds = false;
 }
 
 PrintMsg_PrintPages_Params::PrintMsg_PrintPages_Params()
   : pages() {
 }
 
 PrintMsg_PrintPages_Params::~PrintMsg_PrintPages_Params() {}
 
 void PrintMsg_PrintPages_Params::Reset() {
   params.Reset();
   pages = std::vector<int>();
 }
 
 PrintHostMsg_RequestPrintPreview_Params::
     PrintHostMsg_RequestPrintPreview_Params()
     : is_modifiable(false),
       webnode_only(false),
       has_selection(false),
       selection_only(false) {
 }
 
 PrintHostMsg_RequestPrintPreview_Params::
     ~PrintHostMsg_RequestPrintPreview_Params() {}