A bug was introduced in the Windows version of Python 3.6 which causes `datetime.fromtimestamp(0)` [to throw an error](https://bugs.python.org/issue29097). https://github.com/HearthSim/python-hearthstone/blob/480aa966aaf81b09615d4d0f86978de1f537703e/hearthstone/utils.py#L59 A quick fix for this is to replace the line above with `datetime(1, 1, 1)`.