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

chrome/browser/ui/webui/certificate_viewer_webui.cc

Index: chrome/browser/ui/webui/certificate_viewer_webui.cc
diff --git a/chrome/browser/ui/webui/certificate_viewer_webui.cc b/chrome/browser/ui/webui/certificate_viewer_webui.cc
index f67d3498bf7798367c0957fbdcdde62f90f54064..4969b3e2ae8431acdc0df1abd4ae3cffae43f45d 100644
--- a/chrome/browser/ui/webui/certificate_viewer_webui.cc
+++ b/chrome/browser/ui/webui/certificate_viewer_webui.cc
@@ -347,10 +347,16 @@ void CertificateViewerDialogHandler::RequestCertificateFields(
       l10n_util::GetStringUTF8(IDS_CERT_DETAILS_NOT_AFTER));
   base::Time issued, expires;
   if (x509_certificate_model::GetTimes(cert, &issued, &expires)) {
-    node_details->SetString("payload.val",
-        base::UTF16ToUTF8(base::TimeFormatShortDateAndTime(issued)));
-    alt_node_details->SetString("payload.val",
-        base::UTF16ToUTF8(base::TimeFormatShortDateAndTime(expires)));
+    // The object Time internally saves the time in UTC timezone. This is why we
+    // do a simple UTC string concatenation.
+    node_details->SetString(
+        "payload.val",
+        base::UTF16ToUTF8(base::TimeFormatShortDateAndTime(issued)) + " " +
+            l10n_util::GetStringUTF8(IDS_CERT_DETAILS_UTC_TIMEZONE));
+    alt_node_details->SetString(
+        "payload.val",
+        base::UTF16ToUTF8(base::TimeFormatShortDateAndTime(expires)) + " " +
+            l10n_util::GetStringUTF8(IDS_CERT_DETAILS_UTC_TIMEZONE));
   }
 
   cert_fields->Append(node_details = new base::DictionaryValue());