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88 lines
3.1 KiB
Python
88 lines
3.1 KiB
Python
from __future__ import absolute_import, unicode_literals
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import datetime
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timezonenames = {
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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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}
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# W3 date and time format parser
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# http://www.w3.org/TR/NOTE-datetime
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# Also supports MSSQL-style datetimes as defined at:
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# http://msdn.microsoft.com/en-us/library/ms186724.aspx
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# (basically, allow a space as a date/time/timezone separator)
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def _parse_date_w3dtf(datestr):
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if not datestr.strip():
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return None
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parts = datestr.lower().split('t')
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if len(parts) == 1:
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# This may be a date only, or may be an MSSQL-style date
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parts = parts[0].split()
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if len(parts) == 1:
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# Treat this as a date only
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parts.append('00:00:00z')
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elif len(parts) > 2:
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return None
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date = parts[0].split('-', 2)
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if not date or len(date[0]) != 4:
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return None
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# Ensure that `date` has 3 elements. Using '1' sets the default
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# month to January and the default day to the 1st of the month.
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date.extend(['1'] * (3 - len(date)))
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try:
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year, month, day = [int(i) for i in date]
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except ValueError:
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# `date` may have more than 3 elements or may contain
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# non-integer strings.
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return None
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if parts[1].endswith('z'):
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parts[1] = parts[1][:-1]
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parts.append('z')
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# Append the numeric timezone offset, if any, to parts.
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# If this is an MSSQL-style date then parts[2] already contains
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# the timezone information, so `append()` will not affect it.
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# Add 1 to each value so that if `find()` returns -1 it will be
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# treated as False.
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loc = parts[1].find('-') + 1 or parts[1].find('+') + 1 or len(parts[1]) + 1
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loc = loc - 1
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parts.append(parts[1][loc:])
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parts[1] = parts[1][:loc]
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time = parts[1].split(':', 2)
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# Ensure that time has 3 elements. Using '0' means that the
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# minutes and seconds, if missing, will default to 0.
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time.extend(['0'] * (3 - len(time)))
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tzhour = 0
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tzmin = 0
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if parts[2][:1] in ('-', '+'):
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try:
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tzhour = int(parts[2][1:3])
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tzmin = int(parts[2][4:])
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except ValueError:
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return None
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if parts[2].startswith('-'):
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tzhour = tzhour * -1
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tzmin = tzmin * -1
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else:
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tzhour = timezonenames.get(parts[2], 0)
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try:
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hour, minute, second = [int(float(i)) for i in time]
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except ValueError:
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return None
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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, tzmin, tzhour)
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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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