def hour_to_day(timeperiod):
    """:param timeperiod: as string in YYYYMMDDHH format
    :return string in YYYYMMDD00 format"""
    t = datetime.strptime(timeperiod, SYNERGY_HOURLY_PATTERN)
    return t.strftime(SYNERGY_DAILY_PATTERN)
:param timeperiod: as string in YYYYMMDDHH format
    :return string in YYYYMMDD00 format