def local_datetime_to_timestamp(datetime_obj):
    """Converts the given localized naive datetime object to a UTC timestamp.

    Arguments
    ---------
    datetime_obj : datetime.datetime
        A naive (not timezone-aware) datetime object decipting a specific
        point in time in the local machine timezone.

    Returns
    -------
    int
        The UTC timestamp corresponding to the given datetime object.
    """
    return int(datetime_obj.timestamp())
