diff --git a/tests/test_tradingcalendar.py b/tests/test_tradingcalendar.py
index a5416413..a09bf6f7 100644
--- a/tests/test_tradingcalendar.py
+++ b/tests/test_tradingcalendar.py
@@ -68,18 +68,18 @@ class TestTradingCalendar(TestCase):
         env_start_index = \
             env.trading_days.searchsorted(tradingcalendar_lse.start)
         env_days = env.trading_days[env_start_index:]
-        diff = env_days - tradingcalendar_lse.trading_days
+        end_index = \
+            tradingcalendar_lse.trading_days.searchsorted(env.trading_days[-1])
+        # pandas series slicing is different.
+        cal_days = tradingcalendar_lse.trading_days[:end_index+1]
+        diff = env_days - cal_days
         self.assertEqual(
             len(diff),
             0,
             "{diff} should be empty".format(diff=diff)
         )
 
-        diff2 = tradingcalendar_lse.trading_days - env_days
-        # depending on the time of day, data for the current day
-        # may not be available from yahoo, so don't include end
-        # of the tradingcalendar
-        diff2 = diff2 - self.end
+        diff2 = cal_days - env_days
         self.assertEqual(
             len(diff2),
             0,
diff --git a/zipline/utils/tradingcalendar.py b/zipline/utils/tradingcalendar.py
index d036bd63..dbf90cf3 100644
--- a/zipline/utils/tradingcalendar.py
+++ b/zipline/utils/tradingcalendar.py
@@ -17,13 +17,13 @@
 import pandas as pd
 import pytz
 
-from datetime import datetime, timedelta
+from datetime import datetime
 from dateutil import rrule
 from delorean import Delorean
 
 start = datetime(1990, 1, 1, tzinfo=pytz.utc)
-end_dln = Delorean(datetime.now() - timedelta(days=1), 'US/Eastern')
-end_dln.truncate('day').shift('UTC')
+end_dln = Delorean(datetime.now(), 'US/Eastern')
+end_dln.shift('UTC').truncate('day')
 end = end_dln.datetime