def METHOD_NAME(value, phone_tz):
    """
    adjust a UTC datetime so that it's comparable with a phone datetime
    (like timeEnd, modified_on, etc.)
    returns a timezone-aware date
    """
    phone_tz = _soft_assert_tz_not_string(phone_tz)
    assert value.tzinfo is None
    return value.replace(tzinfo=pytz.utc)