def has_intersecting_sprints(start_date: dt.date, length: int, project_id: int) -> bool:
    """
    Check if the new sprint has any intersections with existing sprints
    :param start_date: the start date of a new sprint
    :param length: the length of a new sprint
    :param project_id: new sprint's project
    :return:
    """
    sprints = Sprint.query.filter_by(is_finished=False, project_id=project_id).all()
    # if we don't have any intersecting sprints then the sprint can be created
    if len(sprints) == 0:
        return False
    # calculate the end date of a new sprint
    end_date = start_date + dt.timedelta(weeks=length)
    for sprint in sprints:
        s_end_date = sprint.start_date + dt.timedelta(weeks=sprint.length)
        # check if the sprint has any overlaps with existing sprints
        has_any = (sprint.start_date <= start_date <= s_end_date or
                   sprint.start_date <= end_date <= s_end_date)
        if has_any:
            return True
    return False