How to change the default search time range in Splunk 6

This is a simple request, but the official docs are out of date.

1. Create a file: $SPLUNK_HOME/etc/apps/search/local/ui-prefs.conf
2. Create a search stanza like this:
   
   [search]
   dispatch.earliest_time = -7d@d
   dispatch.latest_time = now

Restart Splunk and you're good to go!