From bd037f5ce7605e745ca514578de1944248c93b7f Mon Sep 17 00:00:00 2001
From: Christian Schneider
Date: Tue, 28 Jul 2026 16:13:09 +0200
Subject: Use GMT as per
 https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/If-Modified-Since

---
 it_url.class | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'it_url.class')

diff --git a/it_url.class b/it_url.class
index 2eb124d..fbb4101 100644
--- a/it_url.class
+++ b/it_url.class
@@ -202,7 +202,7 @@ static function _default_headers($url, $p)
 	]);
 
 	if (is_int($p['filemtime']))
-		$headers['If-Modified-Since'] = date("r", $p['filemtime']);
+		$headers['If-Modified-Since'] = gmdate("D, d M Y H:i:s T", $p['filemtime']);	# Use GMT as per https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/If-Modified-Since
 	return $headers;
 }
 
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