Adding ability to set timezone in horizon

Change-Id: I5d9c9ece556a9d54c9f2db22c838b51e107f8cbb
diff --git a/horizon/files/horizon_settings/_local_settings.py b/horizon/files/horizon_settings/_local_settings.py
index 6dc19a5..fb340bc 100644
--- a/horizon/files/horizon_settings/_local_settings.py
+++ b/horizon/files/horizon_settings/_local_settings.py
@@ -62,7 +62,7 @@
 
 # The timezone of the server. This should correspond with the timezone
 # of your entire OpenStack installation, and hopefully be in UTC.
-TIME_ZONE = "UTC"
+TIME_ZONE = "{{ server.get('timezone', 'UTC') }}"
 
 COMPRESS_OFFLINE = True