diff --git a/atreyu_backtrader_api/ibstore.py b/atreyu_backtrader_api/ibstore.py
index 15e7852..8ce97a4 100644
--- a/atreyu_backtrader_api/ibstore.py
+++ b/atreyu_backtrader_api/ibstore.py
@@ -1234,7 +1234,8 @@ def reqHistoricalDataEx(self, contract, enddate, begindate,
         self.conn.reqHistoricalData(
             tickerId,
             contract,
-            bytes(intdate.strftime('%Y%m%d %H:%M:%S') + ' GMT'),
+            #bytes(intdate.strftime('%Y%m%d %H:%M:%S') + ' GMT'),
+            bytes(intdate.strftime('%Y%m%d-%H:%M:%S')),
             bytes(duration),
             bytes(barsize),
             bytes(what),
@@ -1270,7 +1271,8 @@ def reqHistoricalData(self, contract, enddate, duration, barsize,
         self.conn.reqHistoricalData(
             tickerId,
             contract,
-            bytes(enddate.strftime('%Y%m%d %H:%M:%S') + ' GMT'),
+            # bytes(enddate.strftime('%Y%m%d %H:%M:%S') + ' GMT'),
+            bytes(enddate.strftime('%Y%m%d-%H:%M:%S')),
             bytes(duration),
             bytes(barsize),
             bytes(what),
@@ -1328,8 +1330,10 @@ def reqHistoricalTicksEx(self, contract, enddate=None, begindate=None,
         self.conn.reqHistoricalTicks(
             tickerId,
             contract,
-            bytes(begindate.strftime('%Y%m%d %H:%M:%S') + ' GMT') if begindate else '',
-            bytes(enddate.strftime('%Y%m%d %H:%M:%S') + ' GMT') if enddate else '',
+            # bytes(begindate.strftime('%Y%m%d %H:%M:%S') + ' GMT') if begindate else '',
+            # bytes(enddate.strftime('%Y%m%d %H:%M:%S') + ' GMT') if enddate else '',
+            bytes(begindate.strftime('%Y%m%d-%H:%M:%S')) if begindate else '',
+            bytes(enddate.strftime('%Y%m%d-%H:%M:%S')) if enddate else '',
             100,
             bytes(what),
             int(useRTH),
@@ -1366,9 +1370,11 @@ def reqHistoricalTicks(self, contract, enddate, begindate,
         self.conn.reqHistoricalTicks(
             tickerId,
             contract,
-            bytes(begindate.strftime('%Y%m%d %H:%M:%S') + ' GMT') if begindate else '',
+            # bytes(begindate.strftime('%Y%m%d %H:%M:%S') + ' GMT') if begindate else '',
+            bytes(begindate.strftime('%Y%m%d-%H:%M:%S')) if begindate else '',
             # bytes(enddate.strftime('%Y%m%d %H:%M:%S') + ' GMT'),
-            bytes(enddate.strftime('%Y%m%d %H:%M:%S') + ' GMT') if enddate else '',
+            # bytes(enddate.strftime('%Y%m%d %H:%M:%S') + ' GMT') if enddate else '',
+            bytes(enddate.strftime('%Y%m%d-%H:%M:%S')) if enddate else '',
             10,
             bytes(what),
             # int(useRTH),