From 4a04dc4e7e882b6b4fd19059e521e261a6703f89 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Paul=20H=C3=A4nsch?= <paul@plutz.net>
Date: Mon, 26 Jul 2021 15:08:44 +0200
Subject: [PATCH] portability GNU `date` / Busybox `date`

---
 file.sh | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/file.sh b/file.sh
index 04a8ef6..6f956df 100755
--- a/file.sh
+++ b/file.sh
@@ -58,8 +58,7 @@ FILE(){
 
   file_size="$(stat -Lc %s "$file")"
   file_date="$(stat -Lc %Y "$file")"
-  http_date="$(date -uRd @$file_date)"
-  http_date="${http_date%+0000}GMT"
+  http_date="$(date -ud "@$file_date" +"%a, %d %b %Y %T GMT")"
   cachedate="$(
     # Parse the allowable date formats from Section 3.3.1 of
     # https://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html
-- 
2.39.2