def worldbosssent(path: str="worldbosstime.txt") -> bool:
    """
    returns if the message 30 mins before worldboss already has been sent.
    :param path: the path to worldbosstime.txt
    :return: boolean, true if it has been sent.
    """
    with open(path) as file:
        sent = int(file.readlines()[0])
    return bool(sent)