From ffebdd2ecd8a4aee1bfd71c02b82dfcefb82ded0 Mon Sep 17 00:00:00 2001
From: 1122455801 <zhangyangffff@gmail.com>
Date: Sat, 15 Jun 2019 19:00:06 +0800
Subject: [PATCH] Update backtesting.py

---
 vnpy/app/cta_strategy/backtesting.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/vnpy/app/cta_strategy/backtesting.py b/vnpy/app/cta_strategy/backtesting.py
index 22ebd22e..45a1c48e 100644
--- a/vnpy/app/cta_strategy/backtesting.py
+++ b/vnpy/app/cta_strategy/backtesting.py
@@ -214,6 +214,10 @@ class BacktestingEngine:
         if not self.end:
             self.end = datetime.now()
 
+        if self.start >= self.end:
+            self.output("起始日期必须小于结束日期")    
+            return        
+
         self.history_data.clear()       # Clear previously loaded history data
 
         # Load 30 days of data each time and allow for progress update