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2 changes: 2 additions & 0 deletions backtrader/utils/dateintern.py
Original file line number Diff line number Diff line change
Expand Up @@ -118,6 +118,8 @@ def tzname(self, dt):
return _time.tzname[self._isdst(dt)]

def _isdst(self, dt):
if not dt:
return False
tt = (dt.year, dt.month, dt.day,
dt.hour, dt.minute, dt.second,
dt.weekday(), 0, 0)
Expand Down