def stringToDatetime(dateString):
    """
    Convert an HTTP date string (one of three formats) to seconds since epoch.

    @type dateString: C{bytes}
    """
    parts = nativeString(dateString).split()

    if not parts[0][0:3].lower() in weekdayname_lower:
        # Weekday is stupid. Might have been omitted.
        try:
            return stringToDatetime(b"Sun, " + dateString)
        except ValueError:
            # Guess not.
            pass

    partlen = len(parts)
    if (partlen == 5 or partlen == 6) and parts[1].isdigit():
        # 1st date format: Sun, 06 Nov 1994 08:49:37 GMT
        # (Note: "GMT" is literal, not a variable timezone)
        # (also handles without "GMT")
        # This is the normal format
        day = parts[1]
        month = parts[2]
        year = parts[3]
        time = parts[4]
    elif (partlen == 3 or partlen == 4) and parts[1].find('-') != -1:
        # 2nd date format: Sunday, 06-Nov-94 08:49:37 GMT
        # (Note: "GMT" is literal, not a variable timezone)
        # (also handles without without "GMT")
        # Two digit year, yucko.
        day, month, year = parts[1].split('-')
        time = parts[2]
        year=int(year)
        if year < 69:
            year = year + 2000
        elif year < 100:
            year = year + 1900
    elif len(parts) == 5:
        # 3rd date format: Sun Nov  6 08:49:37 1994
        # ANSI C asctime() format.
        day = parts[2]
        month = parts[1]
        year = parts[4]
        time = parts[3]
    else:
        raise ValueError("Unknown datetime format %r" % dateString)

    day = int(day)
    month = int(monthname_lower.index(month.lower()))
    year = int(year)
    hour, min, sec = map(int, time.split(':'))
    return int(timegm(year, month, day, hour, min, sec))

    Convert an HTTP date string (one of three formats) to seconds since epoch.

    @type dateString: C{bytes}
    
stackoverflow/venv/lib/python3.6/site-packages/twisted/web/http.py