diff --git a/ohlc/ohlc.py b/ohlc/ohlc.py
index 2246c32..d1f90da 100644
--- a/ohlc/ohlc.py
+++ b/ohlc/ohlc.py
@@ -3,7 +3,13 @@ from datetime import datetime
 from iqfeed import get_daily_data, get_historical_data, minutes as to_minutes
 
 def ohlc(symbol: str, minutes: int = None, start_date: datetime = None, end_date: datetime = None):
+    start_date = start_date or datetime.today()
+    end_date = end_date or datetime.today()
+
+    start_date = datetime.combine(start_date, datetime.min.time())
+    end_date = datetime.combine(end_date, datetime.max.time())
+
     if minutes is None:
-        return get_daily_data(symbol, start_date, end_date or datetime.today())
+        return get_daily_data(symbol, start_date, end_date)
     else:
-        return get_historical_data(symbol, interval = to_minutes(minutes), start_date = start_date, end_date = end_date or datetime.today())
\ No newline at end of file
+        return get_historical_data(symbol, interval = to_minutes(minutes), start_date = start_date, end_date = end_date)
\ No newline at end of file