diff --git a/scripts/install b/scripts/install
index 019b28f..5e2f4f3 100644
--- a/scripts/install
+++ b/scripts/install
@@ -24,6 +24,7 @@ domain=$YNH_APP_ARG_DOMAIN
 path_url=$YNH_APP_ARG_PATH
 is_public=$YNH_APP_ARG_IS_PUBLIC
 language=$YNH_APP_ARG_LANGUAGE
+timezone="$(cat /etc/timezone)"
 
 app=$YNH_APP_INSTANCE_NAME
 
diff --git a/scripts/upgrade b/scripts/upgrade
index bd01ec1..01457ee 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -23,6 +23,7 @@ final_path=$(ynh_app_setting_get --app=$app --key=final_path)
 db_name=$(ynh_app_setting_get --app=$app --key=db_name)
 db_user=$db_name
 phpversion=$(ynh_app_setting_get --app=$app --key=phpversion)
+timezone="$(cat /etc/timezone)"
 
 fpm_footprint=$(ynh_app_setting_get --app=$app --key=fpm_footprint)
 fpm_usage=$(ynh_app_setting_get --app=$app --key=fpm_usage)
@@ -52,6 +53,12 @@ ynh_abort_if_errors
 #=================================================
 ynh_script_progression --message="Ensuring downward compatibility..." --weight=1
 
+# If fpm_footprint doesn't exist, create it
+if [ -z "$timezone" ]; then
+	timezone="$(cat /etc/timezone)"
+	ynh_app_setting_set --app=$app --key=timezone --value=$timezone
+fi
+
 # If fpm_footprint doesn't exist, create it
 if [ -z "$fpm_footprint" ]; then
 	fpm_footprint=low