def format_time(time: dict) -> str:
    """
    Format time dictionary to string.
    :param time: Time dictionary with keys 'hours' and 'minutes'.
    :return: Formatted time string in HH:MM format.
    """
    if time.get("past"):
        time = time.get("past")
        hours = int(time["hours"])
        minutes = int(time["minutes"])
        return f"{hours:02d}:{minutes:02d}"
    else:
        hours = int(time["hours"])
        minutes = int(time["minutes"])
        return f"{hours:02d}:{minutes:02d}"