77 lines
2.8 KiB
Python
77 lines
2.8 KiB
Python
"""Parse ISO8601 dates.
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Originally taken from :pypi:`pyiso8601`
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(https://bitbucket.org/micktwomey/pyiso8601)
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Modified to match the behavior of ``dateutil.parser``:
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- raise :exc:`ValueError` instead of ``ParseError``
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- return naive :class:`~datetime.datetime` by default
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This is the original License:
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Copyright (c) 2007 Michael Twomey
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sub-license, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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"""
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import re
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from datetime import datetime, timedelta, timezone
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from celery.utils.deprecated import warn
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__all__ = ('parse_iso8601',)
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# Adapted from http://delete.me.uk/2005/03/iso8601.html
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ISO8601_REGEX = re.compile(
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r'(?P<year>[0-9]{4})(-(?P<month>[0-9]{1,2})(-(?P<day>[0-9]{1,2})'
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r'((?P<separator>.)(?P<hour>[0-9]{2}):(?P<minute>[0-9]{2})'
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r'(:(?P<second>[0-9]{2})(\.(?P<fraction>[0-9]+))?)?'
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r'(?P<timezone>Z|(([-+])([0-9]{2}):([0-9]{2})))?)?)?)?'
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)
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TIMEZONE_REGEX = re.compile(
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r'(?P<prefix>[+-])(?P<hours>[0-9]{2}).(?P<minutes>[0-9]{2})'
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)
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def parse_iso8601(datestring):
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"""Parse and convert ISO-8601 string to datetime."""
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warn("parse_iso8601", "v5.3", "v6", "datetime.datetime.fromisoformat")
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m = ISO8601_REGEX.match(datestring)
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if not m:
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raise ValueError('unable to parse date string %r' % datestring)
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groups = m.groupdict()
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tz = groups['timezone']
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if tz == 'Z':
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tz = timezone(timedelta(0))
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elif tz:
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m = TIMEZONE_REGEX.match(tz)
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prefix, hours, minutes = m.groups()
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hours, minutes = int(hours), int(minutes)
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if prefix == '-':
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hours = -hours
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minutes = -minutes
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tz = timezone(timedelta(minutes=minutes, hours=hours))
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return datetime(
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int(groups['year']), int(groups['month']),
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int(groups['day']), int(groups['hour'] or 0),
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int(groups['minute'] or 0), int(groups['second'] or 0),
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int(groups['fraction'] or 0), tz
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)
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