From df545c1bacce581eb83a48e015f5a2d8b27144f7 Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Tue, 2 Jul 2024 14:48:12 +0200
Subject: [main] Try to avoid false clock drift warnings

If the browser tries to recover the state of a page after a restart, it
will re-check for clock drift using stale data. Let's hope the browser
will also restore sessionStorage in this case; we store the time of
check in there, to prevent another check after the page is restored from
cache.
---
 modules-available/main/templates/page-main.html | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/modules-available/main/templates/page-main.html b/modules-available/main/templates/page-main.html
index 1b7cc62d..ee85220e 100644
--- a/modules-available/main/templates/page-main.html
+++ b/modules-available/main/templates/page-main.html
@@ -5,11 +5,13 @@
 
 <script type="application/javascript"><!--
 document.addEventListener("DOMContentLoaded", function () {
-	if (Date.now && Math.abs(Date.now() / 1000 - {{now}}) > 300) {
+	if (Date.now && Math.abs(Date.now() / 1000 - {{now}}) > 300
+			&& (!window.sessionStorage || window.sessionStorage.getItem('nau') != {{now}})) {
 		$('#browser-time').text(new Date().toLocaleString());
 		$('#server-time').text(new Date({{now}} * 1000).toLocaleString());
 		$('#time-warner').show();
 	}
+	if (window.sessionStorage) window.sessionStorage.setItem('nau', {{now}});
 });
 //--></script>
 
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