From a701d0c47c2ffe01b6e6ca1b0a700975bc1ca73a Mon Sep 17 00:00:00 2001
From: Scott Sanderson <scoutoss@gmail.com>
Date: Sun, 23 Nov 2014 23:25:25 -0500
Subject: [PATCH] DEV: Explicitly convert string to timezones in get_datetime.

---
 zipline/algorithm.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/zipline/algorithm.py b/zipline/algorithm.py
index a7dce8e2..7797798c 100644
--- a/zipline/algorithm.py
+++ b/zipline/algorithm.py
@@ -784,6 +784,8 @@ class TradingAlgorithm(object):
         assert date_copy.tzinfo == pytz.utc, \
             "Algorithm should have a utc datetime"
         if tz is not None:
+            if isinstance(tz, basestring):
+                tz = pytz.timezone(tz)
             date_copy = date_copy.astimezone(tz)
         return date_copy