diff --git a/hts/HTS.py b/hts/HTS.py
index 76e4225..dc97b64 100644
--- a/hts/HTS.py
+++ b/hts/HTS.py
@@ -287,7 +287,7 @@ class HTS:
         size = objStockChart.GetHeaderValue(3)
 
         #print("날짜", "시간", "시가", "고가", "저가", "종가", "거래량")
-        start_time = datetime.strptime(day + " 090000", '%Y%m%d %H%M%S')
+        start_time = datetime.strptime(given_day + " 090000", '%Y%m%d %H%M%S')
         for i in range(size-1, -1, -1):
             day = objStockChart.GetDataValue(0, i)
             if day < int_given_day: