Client exception

[hootnot]

import oandapy
from datetime import datetime, timedelta
import json

oanda = oandapy.API(environment="practice", access_token="...")

instrument = 'AU200_AUD'
start = datetime(2010, 4, 1, 16, 0, 1)
end =   datetime(2010, 4, 4, 3, 20, 1)

try:
    candles = oanda.get_history(
       instrument = instrument,
       granularity = 'M1',
       candleFormat = 'midpoint',
       alignmentTimezone = 'GMT',
       start = start.isoformat(),
       end = end.isoformat()
    )
except oandapy.OandaError as e:
    print "%s" % e
except oandapy.ClientError as e:
    print "%s" % e
else:
    print json.dumps(candles, indent=2)

$ python issue27.py
client error: No data
changing end to datetime(2010, 4, 15, 3, 20, 1) will return a response with candle data