From 156d6e46a1d4db9e5aea513f904348c3c63c4c18 Mon Sep 17 00:00:00 2001
From: CanbiZ <47820557+MickLesk@users.noreply.github.com>
Date: Sat, 22 Nov 2025 17:56:50 +0100
Subject: [PATCH] core: Improve timezone detection

---
 misc/build.func | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/misc/build.func b/misc/build.func
index d7afca1c7..0ef0d4a5b 100644
--- a/misc/build.func
+++ b/misc/build.func
@@ -936,7 +936,12 @@ install_script() {
     systemctl -q stop ping-instances.service
   fi
   NEXTID=$(pvesh get /cluster/nextid)
-  timezone=$(cat /etc/timezone)
+  # Read timezone - fallback for Debian 13/Proxmox 9+ where /etc/timezone doesn't exist
+  if [[ -f /etc/timezone ]]; then
+    timezone=$(cat /etc/timezone)
+  else
+    timezone=$(timedatectl show --value --property=Timezone 2>/dev/null || echo "UTC")
+  fi
   header_info
   while true; do