from dateutil import tz


def utc_to_eastern(utc_dt):
    """
    Convert a datetime obejct in UTC to one in Eastern Time Zone
    The utc_dt can be 'naive' (meaning that it does not have tzinfo)
    """
    eastern = tz.gettz('America/Eastern')
    utc_dt = utc_dt.replace(tzinfo=tz.tzutc())
    return utc_dt.astimezone(eastern)