From e42c8136d95056708cd8ec4dbb1aa517f4902cb3 Mon Sep 17 00:00:00 2001
From: Bian Jiang <borderj@gmail.com>
Date: Thu, 5 May 2016 14:23:55 +0800
Subject: [PATCH] FIX IB Next Month Bug

---
 vn.trader/ibGateway/ibGateway.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/vn.trader/ibGateway/ibGateway.py b/vn.trader/ibGateway/ibGateway.py
index e9a17ec2..12e9ae6a 100644
--- a/vn.trader/ibGateway/ibGateway.py
+++ b/vn.trader/ibGateway/ibGateway.py
@@ -188,7 +188,7 @@ class IbGateway(VtGateway):
             # 期货 如果没有设置过期时间, 默认设置为下个月
             dt_obj = datetime.now()
             days = calendar.monthrange(dt_obj.year, dt_obj.month)[1]
-            nextMonth = dt_obj + timedelta(days=days)
+            nextMonth = dt_obj + timedelta(days=(days - dt_obj.day + 1))
             contract.m_expiry = nextMonth.strftime('%Y%m')
 
         self.connection.reqMktData(self.tickerId, contract, '', False)