

def nntplib__parse_datetime(date_str, time_str=None):
    """Parse a pair of (date, time) strings, and return a datetime object.
    If only the date is given, it is assumed to be date and time
    concatenated together (e.g. response to the DATE command).
    """
    time_str = date_str[-6:]
    date_str = date_str[:-6]
    hours = int(time_str[:2])
    minutes = int(time_str[2:4])
    seconds = int(time_str[4:])
    year = int(date_str[:-4])
    month = int(date_str[-4:-2])
    day = int(date_str[-2:])
    # RFC 3977 doesn't say how to interpret 2-char years.  Assume that
    # there are no dates before 1970 on Usenet.
    if year < 70:
        year += 2000
    elif year < 100:
        year += 1900
    return [year, month, day, hours, minutes, seconds]

