def _time_to_micros(time):
    """Convert a time into microseconds since midnight.
    Parameters
    ----------
    time : datetime.time
        The time to convert.
    Returns
    -------
    us : int
        The number of microseconds since midnight.
    Notes
    -----
    This does not account for leap seconds or daylight savings.
    """
    seconds = time.hour * 60 * 60 + time.minute * 60 + time.second
    return 1000000 * seconds + time.microsecond
