tzinfo = pytz.timezone('Asia/Shanghai')
MongoClient('mongodb://' + host + ':' + port + '/', username=username,
password=password,tz_aware=True,tzinfo=tzinfo)
tzinfo = pytz.timezone('Asia/Shanghai')
MongoClient('mongodb://' + host + ':' + port + '/', username=username,
password=password,tz_aware=True,tzinfo=tzinfo)