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
return _parse_date_group_rfc822(m)
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