feedparser.py 文件源码

def _parse_date_rfc822(dt):
    """Parse RFC 822 dates and times, with one minor
    difference: years may be 4DIGIT or 2DIGIT.
    http://tools.ietf.org/html/rfc822#section-5"""
    try:
        m = _rfc822_match(dt.lower()).groupdict(0)
    except AttributeError:
        return None

    # Calculate a date and timestamp
    for k in ('year', 'day', 'hour', 'minute', 'second'):
        m[k] = int(m[k])
    m['month'] = _rfc822_months.index(m['month']) + 1
    # If the year is 2 digits, assume everything in the 90's is the 1990's
    if m['year'] < 100:
        m['year'] += (1900, 2000)[m['year'] < 90]
    stamp = datetime.datetime(*[m[i] for i in
                ('year', 'month', 'day', 'hour', 'minute', 'second')])

    # Use the timezone information to calculate the difference between
    # the given date and timestamp and Universal Coordinated Time
    tzhour = 0
    tzmin = 0
    if m['tz'] and m['tz'].startswith('gmt'):
        # Handle GMT and GMT+hh:mm timezone syntax (the trailing
        # timezone info will be handled by the next `if` block)
        m['tz'] = ''.join(m['tz'][3:].split(':')) or 'gmt'
    if not m['tz']:
        pass
    elif m['tz'].startswith('+'):
        tzhour = int(m['tz'][1:3])
        tzmin = int(m['tz'][3:])
    elif m['tz'].startswith('-'):
        tzhour = int(m['tz'][1:3]) * -1
        tzmin = int(m['tz'][3:]) * -1
    else:
        tzhour = _rfc822_tznames[m['tz']]
    delta = datetime.timedelta(0, 0, 0, 0, tzmin, tzhour)

    # Return the date and timestamp in UTC
    return (stamp - delta).utctimetuple()