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121 lines
3.8 KiB
Python
121 lines
3.8 KiB
Python
from __future__ import absolute_import, unicode_literals
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import datetime
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timezone_names = {
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'ut': 0, 'gmt': 0, 'z': 0,
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'adt': -3, 'ast': -4, 'at': -4,
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'edt': -4, 'est': -5, 'et': -5,
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'cdt': -5, 'cst': -6, 'ct': -6,
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'mdt': -6, 'mst': -7, 'mt': -7,
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'pdt': -7, 'pst': -8, 'pt': -8,
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'a': -1, 'n': 1,
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'm': -12, 'y': 12,
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'met': 1, 'mest': 2,
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}
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day_names = {'mon', 'tue', 'wed', 'thu', 'fri', 'sat', 'sun'}
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months = {
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'jan': 1, 'feb': 2, 'mar': 3, 'apr': 4, 'may': 5, 'jun': 6,
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'jul': 7, 'aug': 8, 'sep': 9, 'oct': 10, 'nov': 11, 'dec': 12,
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}
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def _parse_date_rfc822(date):
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"""Parse RFC 822 dates and times
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http://tools.ietf.org/html/rfc822#section-5
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There are some formatting differences that are accounted for:
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1. Years may be two or four digits.
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2. The month and day can be swapped.
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3. Additional timezone names are supported.
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4. A default time and timezone are assumed if only a date is present.
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:param str date: a date/time string that will be converted to a time tuple
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:returns: a UTC time tuple, or None
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:rtype: time.struct_time | None
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"""
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parts = date.lower().split()
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if len(parts) < 5:
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# Assume that the time and timezone are missing
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parts.extend(('00:00:00', '0000'))
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# Remove the day name
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if parts[0][:3] in day_names:
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parts = parts[1:]
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if len(parts) < 5:
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# If there are still fewer than five parts, there's not enough
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# information to interpret this.
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return None
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# Handle the day and month name.
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month = months.get(parts[1][:3])
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try:
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day = int(parts[0])
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except ValueError:
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# Check if the day and month are swapped.
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if months.get(parts[0][:3]):
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try:
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day = int(parts[1])
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except ValueError:
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return None
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month = months.get(parts[0][:3])
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else:
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return None
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if not month:
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return None
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# Handle the year.
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try:
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year = int(parts[2])
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except ValueError:
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return None
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# Normalize two-digit years:
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# Anything in the 90's is interpreted as 1990 and on.
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# Anything 89 or less is interpreted as 2089 or before.
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if len(parts[2]) <= 2:
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year += (1900, 2000)[year < 90]
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# Handle the time (default to 00:00:00).
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time_parts = parts[3].split(':')
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time_parts.extend(('0',) * (3 - len(time_parts)))
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try:
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(hour, minute, second) = [int(i) for i in time_parts]
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except ValueError:
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return None
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# Handle the timezone information, if any (default to +0000).
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# Strip 'Etc/' from the timezone.
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if parts[4].startswith('etc/'):
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parts[4] = parts[4][4:]
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# Normalize timezones that start with 'gmt':
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# GMT-05:00 => -0500
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# GMT => GMT
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if parts[4].startswith('gmt'):
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parts[4] = ''.join(parts[4][3:].split(':')) or 'gmt'
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# Handle timezones like '-0500', '+0500', and 'EST'
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if parts[4] and parts[4][0] in ('-', '+'):
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try:
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timezone_hours = int(parts[4][1:3])
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timezone_minutes = int(parts[4][3:])
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except ValueError:
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return None
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if parts[4].startswith('-'):
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timezone_hours *= -1
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timezone_minutes *= -1
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else:
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timezone_hours = timezone_names.get(parts[4], 0)
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timezone_minutes = 0
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# Create the datetime object and timezone delta objects
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try:
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stamp = datetime.datetime(year, month, day, hour, minute, second)
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except ValueError:
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return None
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delta = datetime.timedelta(0, 0, 0, 0, timezone_minutes, timezone_hours)
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# Return the date and timestamp in a UTC 9-tuple
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try:
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return (stamp - delta).utctimetuple()
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except (OverflowError, ValueError):
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# IronPython throws ValueErrors instead of OverflowErrors
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return None
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