Set timezone before calling date

Summary:
PhabricatorAccessLog called date() before we set the timezone; this
reorders the commands.

Test Plan: loaded my sandbox; checked log to see that hphp didn't complain

Reviewers: epriestley, jungejason

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D2911