From 3711bf377538cfb0e3912214e2cdaedcd6228233 Mon Sep 17 00:00:00 2001
From: Eddie Hebert <ehebert@quantopian.com>
Date: Wed, 1 May 2013 16:35:51 -0400
Subject: [PATCH] ENH: Add a utility to reverse a utc timestamp to dst.

Mirror the exchange_dt_in_exchange helper function.
Useful for inspecting data interactively.
---
 zipline/finance/trading.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/zipline/finance/trading.py b/zipline/finance/trading.py
index 4b356565..9292595f 100644
--- a/zipline/finance/trading.py
+++ b/zipline/finance/trading.py
@@ -122,6 +122,10 @@ class TradingEnvironment(object):
             tzinfo=pytz.utc
         )
 
+    def utc_dt_in_exchange(self, dt):
+        delorean = Delorean(dt, pytz.utc.zone)
+        return delorean.shift(self.exchange_tz).datetime
+
     def exchange_dt_in_utc(self, dt):
         delorean = Delorean(dt, self.exchange_tz)
         return delorean.shift(pytz.utc.zone).datetime