fix setting timezone as Java option

Signed-off-by: Markus Storm <[email protected]>

functions/system.bash

@@ -100,7 +100,7 @@ timezone_setting() {
   elif [[ -n $timezone ]]; then
     echo -n "$(timestamp) [openHABian] Setting timezone based on openhabian.conf... "
     if ! running_in_docker && ! running_on_github; then
-      if cond_redirect timedatectl set-timezone "$timezone"; then echo "OK ($(timedatectl | grep zone | cut -d: -f2))"; else echo "FAILED"; return 1; fi
+      if cond_redirect timedatectl set-timezone "$timezone"; then echo "OK ($timezone)"; else echo "FAILED"; return 1; fi
     else
       echo "SKIPPED"
     fi
@@ -114,6 +114,8 @@ timezone_setting() {
     if ! cond_redirect pip3 install --upgrade tzupdate; then echo "FAILED (update tzupdate)"; return 1; fi
     if cond_redirect tzupdate; then echo "OK ($(cat /etc/timezone))"; else echo "FAILED"; return 1; fi
   fi
+
+  sed -ri "s|^(EXTRA_JAVA_OPTS.*interning=true)|\1 -Duser.timezone=${timezone:-Europe/London}|g" /etc/default/openhab
 }
 
 ## Function for setting the locale of the current system.