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aniso8601 (10.0.1)

Published 2026-02-24 14:09:35 +00:00 by atheaadmin

Installation

pip install --index-url  aniso8601

About this package

A library for parsing ISO 8601 strings.

aniso8601

Another ISO 8601 parser for Python

Features

  • Pure Python implementation

  • Logical behavior

    • Parse a time, get a datetime.time <http://docs.python.org/3/library/datetime.html#datetime.time>_
    • Parse a date, get a datetime.date <http://docs.python.org/3/library/datetime.html#datetime.date>_
    • Parse a datetime, get a datetime.datetime <http://docs.python.org/3/library/datetime.html#datetime.datetime>_
    • Parse a duration, get a datetime.timedelta <http://docs.python.org/3/library/datetime.html#datetime.timedelta>_
    • Parse an interval, get a tuple of dates or datetimes
    • Parse a repeating interval, get a date or datetime generator <https://wiki.python.org/moin/Generators>_

  • UTC offset represented as fixed-offset tzinfo

  • Parser separate from representation, allowing parsing to different datetime representations (see Builders_)

  • No regular expressions

Installation

The recommended installation method is to use pip::

$ pip install aniso8601

Alternatively, you can download the source (git repository hosted at Codeberg <https://codeberg.org/nielsenb-jf/aniso8601>_) and install directly::

$ python setup.py install

Use

Parsing datetimes

Consider datetime.datetime.fromisoformat <https://docs.python.org/3/library/datetime.html#datetime.datetime.fromisoformat>_ for basic ISO 8601 datetime parsing

To parse a typical ISO 8601 datetime string::

import aniso8601 aniso8601.parse_datetime('1977-06-10T12:00:00Z') datetime.datetime(1977, 6, 10, 12, 0, tzinfo=+0:00:00 UTC)

Alternative delimiters can be specified, for example, a space::

aniso8601.parse_datetime('1977-06-10 12:00:00Z', delimiter=' ') datetime.datetime(1977, 6, 10, 12, 0, tzinfo=+0:00:00 UTC)

UTC offsets are supported::

aniso8601.parse_datetime('1979-06-05T08:00:00-08:00') datetime.datetime(1979, 6, 5, 8, 0, tzinfo=-8:00:00 UTC)

If a UTC offset is not specified, the returned datetime will be naive::

aniso8601.parse_datetime('1983-01-22T08:00:00') datetime.datetime(1983, 1, 22, 8, 0)

Leap seconds are currently not supported and attempting to parse one raises a :code:LeapSecondError::

aniso8601.parse_datetime('2018-03-06T23:59:60') Traceback (most recent call last): File "", line 1, in File "/home/nielsenb/Jetfuse/aniso8601/aniso8601/aniso8601/time.py", line 196, in parse_datetime return builder.build_datetime(datepart, timepart) File "/home/nielsenb/Jetfuse/aniso8601/aniso8601/aniso8601/builders/python.py", line 237, in build_datetime cls._build_object(time)) File "/home/nielsenb/Jetfuse/aniso8601/aniso8601/aniso8601/builders/init.py", line 336, in _build_object return cls.build_time(hh=parsetuple.hh, mm=parsetuple.mm, File "/home/nielsenb/Jetfuse/aniso8601/aniso8601/aniso8601/builders/python.py", line 191, in build_time hh, mm, ss, tz = cls.range_check_time(hh, mm, ss, tz) File "/home/nielsenb/Jetfuse/aniso8601/aniso8601/aniso8601/builders/init.py", line 266, in range_check_time raise LeapSecondError('Leap seconds are not supported.') aniso8601.exceptions.LeapSecondError: Leap seconds are not supported.

To get the resolution of an ISO 8601 datetime string::

aniso8601.get_datetime_resolution('1977-06-10T12:00:00Z') == aniso8601.resolution.TimeResolution.Seconds True aniso8601.get_datetime_resolution('1977-06-10T12:00') == aniso8601.resolution.TimeResolution.Minutes True aniso8601.get_datetime_resolution('1977-06-10T12') == aniso8601.resolution.TimeResolution.Hours True

Note that datetime resolutions map to :code:TimeResolution as a valid datetime must have at least one time member so the resolution mapping is equivalent.

Parsing dates

Consider datetime.date.fromisoformat <https://docs.python.org/3/library/datetime.html#datetime.date.fromisoformat>_ for basic ISO 8601 date parsing

To parse a date represented in an ISO 8601 string::

import aniso8601 aniso8601.parse_date('1984-04-23') datetime.date(1984, 4, 23)

Basic format is supported as well::

aniso8601.parse_date('19840423') datetime.date(1984, 4, 23)

To parse a date using the ISO 8601 week date format::

aniso8601.parse_date('1986-W38-1') datetime.date(1986, 9, 15)

To parse an ISO 8601 ordinal date::

aniso8601.parse_date('1988-132') datetime.date(1988, 5, 11)

To get the resolution of an ISO 8601 date string::

aniso8601.get_date_resolution('1981-04-05') == aniso8601.resolution.DateResolution.Day True aniso8601.get_date_resolution('1981-04') == aniso8601.resolution.DateResolution.Month True aniso8601.get_date_resolution('1981') == aniso8601.resolution.DateResolution.Year True

Parsing times

Consider datetime.time.fromisoformat <https://docs.python.org/3/library/datetime.html#datetime.time.fromisoformat>_ for basic ISO 8601 time parsing

To parse a time formatted as an ISO 8601 string::

import aniso8601 aniso8601.parse_time('11:31:14') datetime.time(11, 31, 14)

As with all of the above, basic format is supported::

aniso8601.parse_time('113114') datetime.time(11, 31, 14)

A UTC offset can be specified for times::

aniso8601.parse_time('17:18:19-02:30') datetime.time(17, 18, 19, tzinfo=-2:30:00 UTC) aniso8601.parse_time('171819Z') datetime.time(17, 18, 19, tzinfo=+0:00:00 UTC)

Reduced accuracy is supported::

aniso8601.parse_time('21:42') datetime.time(21, 42) aniso8601.parse_time('22') datetime.time(22, 0)

A decimal fraction is always allowed on the lowest order element of an ISO 8601 formatted time::

aniso8601.parse_time('22:33.5') datetime.time(22, 33, 30) aniso8601.parse_time('23.75') datetime.time(23, 45)

The decimal fraction can be specified with a comma instead of a full-stop::

aniso8601.parse_time('22:33,5') datetime.time(22, 33, 30) aniso8601.parse_time('23,75') datetime.time(23, 45)

Leap seconds are currently not supported and attempting to parse one raises a :code:LeapSecondError::

aniso8601.parse_time('23:59:60') Traceback (most recent call last): File "", line 1, in File "/home/nielsenb/Jetfuse/aniso8601/aniso8601/aniso8601/time.py", line 174, in parse_time return builder.build_time(hh=hourstr, mm=minutestr, ss=secondstr, tz=tz) File "/home/nielsenb/Jetfuse/aniso8601/aniso8601/aniso8601/builders/python.py", line 191, in build_time hh, mm, ss, tz = cls.range_check_time(hh, mm, ss, tz) File "/home/nielsenb/Jetfuse/aniso8601/aniso8601/aniso8601/builders/init.py", line 266, in range_check_time raise LeapSecondError('Leap seconds are not supported.') aniso8601.exceptions.LeapSecondError: Leap seconds are not supported.

To get the resolution of an ISO 8601 time string::

aniso8601.get_time_resolution('11:31:14') == aniso8601.resolution.TimeResolution.Seconds True aniso8601.get_time_resolution('11:31') == aniso8601.resolution.TimeResolution.Minutes True aniso8601.get_time_resolution('11') == aniso8601.resolution.TimeResolution.Hours True

Parsing durations

To parse a duration formatted as an ISO 8601 string::

import aniso8601 aniso8601.parse_duration('P1Y2M3DT4H54M6S') datetime.timedelta(428, 17646)

Reduced accuracy is supported::

aniso8601.parse_duration('P1Y') datetime.timedelta(365)

A decimal fraction is allowed on the lowest order element::

aniso8601.parse_duration('P1YT3.5M') datetime.timedelta(365, 210)

The decimal fraction can be specified with a comma instead of a full-stop::

aniso8601.parse_duration('P1YT3,5M') datetime.timedelta(365, 210)

Parsing a duration from a combined date and time is supported as well::

aniso8601.parse_duration('P0001-01-02T01:30:05') datetime.timedelta(397, 5405)

To get the resolution of an ISO 8601 duration string::

aniso8601.get_duration_resolution('P1Y2M3DT4H54M6S') == aniso8601.resolution.DurationResolution.Seconds True aniso8601.get_duration_resolution('P1Y2M3DT4H54M') == aniso8601.resolution.DurationResolution.Minutes True aniso8601.get_duration_resolution('P1Y2M3DT4H') == aniso8601.resolution.DurationResolution.Hours True aniso8601.get_duration_resolution('P1Y2M3D') == aniso8601.resolution.DurationResolution.Days True aniso8601.get_duration_resolution('P1Y2M') == aniso8601.resolution.DurationResolution.Months True aniso8601.get_duration_resolution('P1Y') == aniso8601.resolution.DurationResolution.Years True

The default :code:PythonTimeBuilder assumes years are 365 days, and months are 30 days. Where calendar level accuracy is required, a RelativeTimeBuilder <https://codeberg.org/nielsenb-jf/relativetimebuilder>_ can be used, see also Builders_.

Parsing intervals

To parse an interval specified by a start and end::

import aniso8601 aniso8601.parse_interval('2007-03-01T13:00:00/2008-05-11T15:30:00') (datetime.datetime(2007, 3, 1, 13, 0), datetime.datetime(2008, 5, 11, 15, 30))

Intervals specified by a start time and a duration are supported::

aniso8601.parse_interval('2007-03-01T13:00:00Z/P1Y2M10DT2H30M') (datetime.datetime(2007, 3, 1, 13, 0, tzinfo=+0:00:00 UTC), datetime.datetime(2008, 5, 9, 15, 30, tzinfo=+0:00:00 UTC))

A duration can also be specified by a duration and end time::

aniso8601.parse_interval('P1M/1981-04-05') (datetime.date(1981, 4, 5), datetime.date(1981, 3, 6))

Notice that the result of the above parse is not in order from earliest to latest. If sorted intervals are required, simply use the :code:sorted keyword as shown below::

sorted(aniso8601.parse_interval('P1M/1981-04-05')) [datetime.date(1981, 3, 6), datetime.date(1981, 4, 5)]

The end of an interval is returned as a datetime when required to maintain the resolution specified by a duration, even if the duration start is given as a date::

aniso8601.parse_interval('2014-11-12/PT4H54M6.5S') (datetime.date(2014, 11, 12), datetime.datetime(2014, 11, 12, 4, 54, 6, 500000)) aniso8601.parse_interval('2007-03-01/P1.5D') (datetime.date(2007, 3, 1), datetime.datetime(2007, 3, 2, 12, 0))

Concise representations are supported::

aniso8601.parse_interval('2020-01-01/02') (datetime.date(2020, 1, 1), datetime.date(2020, 1, 2)) aniso8601.parse_interval('2007-12-14T13:30/15:30') (datetime.datetime(2007, 12, 14, 13, 30), datetime.datetime(2007, 12, 14, 15, 30)) aniso8601.parse_interval('2008-02-15/03-14') (datetime.date(2008, 2, 15), datetime.date(2008, 3, 14)) aniso8601.parse_interval('2007-11-13T09:00/15T17:00') (datetime.datetime(2007, 11, 13, 9, 0), datetime.datetime(2007, 11, 15, 17, 0))

Repeating intervals are supported as well, and return a generator <https://wiki.python.org/moin/Generators>_::

aniso8601.parse_repeating_interval('R3/1981-04-05/P1D') <generator object _date_generator at 0x7fd800d3b320> list(aniso8601.parse_repeating_interval('R3/1981-04-05/P1D')) [datetime.date(1981, 4, 5), datetime.date(1981, 4, 6), datetime.date(1981, 4, 7)]

Repeating intervals are allowed to go in the reverse direction::

list(aniso8601.parse_repeating_interval('R2/PT1H2M/1980-03-05T01:01:00')) [datetime.datetime(1980, 3, 5, 1, 1), datetime.datetime(1980, 3, 4, 23, 59)]

Unbounded intervals are also allowed (Python 2)::

result = aniso8601.parse_repeating_interval('R/PT1H2M/1980-03-05T01:01:00') result.next() datetime.datetime(1980, 3, 5, 1, 1) result.next() datetime.datetime(1980, 3, 4, 23, 59)

or for Python 3::

result = aniso8601.parse_repeating_interval('R/PT1H2M/1980-03-05T01:01:00') next(result) datetime.datetime(1980, 3, 5, 1, 1) next(result) datetime.datetime(1980, 3, 4, 23, 59)

Note that you should never try to convert a generator produced by an unbounded interval to a list::

list(aniso8601.parse_repeating_interval('R/PT1H2M/1980-03-05T01:01:00')) Traceback (most recent call last): File "", line 1, in File "/home/nielsenb/Jetfuse/aniso8601/aniso8601/aniso8601/builders/python.py", line 560, in _date_generator_unbounded currentdate += timedelta OverflowError: date value out of range

To get the resolution of an ISO 8601 interval string::

aniso8601.get_interval_resolution('2007-03-01T13:00:00/2008-05-11T15:30:00') == aniso8601.resolution.IntervalResolution.Seconds True aniso8601.get_interval_resolution('2007-03-01T13:00/2008-05-11T15:30') == aniso8601.resolution.IntervalResolution.Minutes True aniso8601.get_interval_resolution('2007-03-01T13/2008-05-11T15') == aniso8601.resolution.IntervalResolution.Hours True aniso8601.get_interval_resolution('2007-03-01/2008-05-11') == aniso8601.resolution.IntervalResolution.Day True aniso8601.get_interval_resolution('2007-03/P1Y') == aniso8601.resolution.IntervalResolution.Month True aniso8601.get_interval_resolution('2007/P1Y') == aniso8601.resolution.IntervalResolution.Year True

And for repeating ISO 8601 interval strings::

aniso8601.get_repeating_interval_resolution('R3/1981-04-05/P1D') == aniso8601.resolution.IntervalResolution.Day True aniso8601.get_repeating_interval_resolution('R/PT1H2M/1980-03-05T01:01:00') == aniso8601.resolution.IntervalResolution.Seconds True

Builders

Builders can be used to change the output format of a parse operation. All parse functions have a :code:builder keyword argument which accepts a builder class.

Two builders are included. The :code:PythonTimeBuilder (the default) in the :code:aniso8601.builders.python module, and the :code:TupleBuilder which returns the parse result as a corresponding named tuple and is located in the :code:aniso8601.builders module.

Information on writing a builder can be found in BUILDERS </BUILDERS.rst>_.

The following builders are available as separate projects:

  • RelativeTimeBuilder <https://codeberg.org/nielsenb-jf/relativetimebuilder>_ supports parsing to datetutil relativedelta types <https://dateutil.readthedocs.io/en/stable/relativedelta.html>_ for calendar level accuracy
  • AttoTimeBuilder <https://codeberg.org/nielsenb-jf/attotimebuilder>_ supports parsing directly to attotime attodatetime and attotimedelta types <https://codeberg.org/nielsenb-jf/attotime>_ which support sub-nanosecond precision
  • NumPyTimeBuilder <https://codeberg.org/nielsenb-jf/numpytimebuilder>_ supports parsing directly to NumPy datetime64 and timedelta64 types <https://docs.scipy.org/doc/numpy/reference/arrays.datetime.html>_

TupleBuilder

The :code:TupleBuilder returns parse results as named tuples <https://docs.python.org/3/library/collections.html#collections.namedtuple>_. It is located in the :code:aniso8601.builders module.

Datetimes ^^^^^^^^^

Parsing a datetime returns a :code:DatetimeTuple containing :code:Date and :code:Time tuples . The date tuple contains the following parse components: :code:YYYY, :code:MM, :code:DD, :code:Www, :code:D, :code:DDD. The time tuple contains the following parse components :code:hh, :code:mm, :code:ss, :code:tz, where :code:tz itself is a tuple with the following components :code:negative, :code:Z, :code:hh, :code:mm, :code:name with :code:negative and :code:Z being booleans::

import aniso8601 from aniso8601.builders import TupleBuilder aniso8601.parse_datetime('1977-06-10T12:00:00', builder=TupleBuilder) Datetime(date=Date(YYYY='1977', MM='06', DD='10', Www=None, D=None, DDD=None), time=Time(hh='12', mm='00', ss='00', tz=None)) aniso8601.parse_datetime('1979-06-05T08:00:00-08:00', builder=TupleBuilder) Datetime(date=Date(YYYY='1979', MM='06', DD='05', Www=None, D=None, DDD=None), time=Time(hh='08', mm='00', ss='00', tz=Timezone(negative=True, Z=None, hh='08', mm='00', name='-08:00')))

Dates ^^^^^

Parsing a date returns a :code:DateTuple containing the following parse components: :code:YYYY, :code:MM, :code:DD, :code:Www, :code:D, :code:DDD::

import aniso8601 from aniso8601.builders import TupleBuilder aniso8601.parse_date('1984-04-23', builder=TupleBuilder) Date(YYYY='1984', MM='04', DD='23', Www=None, D=None, DDD=None) aniso8601.parse_date('1986-W38-1', builder=TupleBuilder) Date(YYYY='1986', MM=None, DD=None, Www='38', D='1', DDD=None) aniso8601.parse_date('1988-132', builder=TupleBuilder) Date(YYYY='1988', MM=None, DD=None, Www=None, D=None, DDD='132')

Times ^^^^^

Parsing a time returns a :code:TimeTuple containing following parse components: :code:hh, :code:mm, :code:ss, :code:tz, where :code:tz is a :code:TimezoneTuple with the following components :code:negative, :code:Z, :code:hh, :code:mm, :code:name, with :code:negative and :code:Z being booleans::

import aniso8601 from aniso8601.builders import TupleBuilder aniso8601.parse_time('11:31:14', builder=TupleBuilder) Time(hh='11', mm='31', ss='14', tz=None) aniso8601.parse_time('171819Z', builder=TupleBuilder) Time(hh='17', mm='18', ss='19', tz=Timezone(negative=False, Z=True, hh=None, mm=None, name='Z')) aniso8601.parse_time('17:18:19-02:30', builder=TupleBuilder) Time(hh='17', mm='18', ss='19', tz=Timezone(negative=True, Z=None, hh='02', mm='30', name='-02:30'))

Durations ^^^^^^^^^

Parsing a duration returns a :code:DurationTuple containing the following parse components: :code:PnY, :code:PnM, :code:PnW, :code:PnD, :code:TnH, :code:TnM, :code:TnS::

import aniso8601 from aniso8601.builders import TupleBuilder aniso8601.parse_duration('P1Y2M3DT4H54M6S', builder=TupleBuilder) Duration(PnY='1', PnM='2', PnW=None, PnD='3', TnH='4', TnM='54', TnS='6') aniso8601.parse_duration('P7W', builder=TupleBuilder) Duration(PnY=None, PnM=None, PnW='7', PnD=None, TnH=None, TnM=None, TnS=None)

Intervals ^^^^^^^^^

Parsing an interval returns an :code:IntervalTuple containing the following parse components: :code:start, :code:end, :code:duration, :code:start and :code:end may both be datetime or date tuples, :code:duration is a duration tuple::

import aniso8601 from aniso8601.builders import TupleBuilder aniso8601.parse_interval('2007-03-01T13:00:00/2008-05-11T15:30:00', builder=TupleBuilder) Interval(start=Datetime(date=Date(YYYY='2007', MM='03', DD='01', Www=None, D=None, DDD=None), time=Time(hh='13', mm='00', ss='00', tz=None)), end=Datetime(date=Date(YYYY='2008', MM='05', DD='11', Www=None, D=None, DDD=None), time=Time(hh='15', mm='30', ss='00', tz=None)), duration=None) aniso8601.parse_interval('2007-03-01T13:00:00Z/P1Y2M10DT2H30M', builder=TupleBuilder) Interval(start=Datetime(date=Date(YYYY='2007', MM='03', DD='01', Www=None, D=None, DDD=None), time=Time(hh='13', mm='00', ss='00', tz=Timezone(negative=False, Z=True, hh=None, mm=None, name='Z'))), end=None, duration=Duration(PnY='1', PnM='2', PnW=None, PnD='10', TnH='2', TnM='30', TnS=None)) aniso8601.parse_interval('P1M/1981-04-05', builder=TupleBuilder) Interval(start=None, end=Date(YYYY='1981', MM='04', DD='05', Www=None, D=None, DDD=None), duration=Duration(PnY=None, PnM='1', PnW=None, PnD=None, TnH=None, TnM=None, TnS=None))

A repeating interval returns a :code:RepeatingIntervalTuple containing the following parse components: :code:R, :code:Rnn, :code:interval, where :code:R is a boolean, :code:True for an unbounded interval, :code:False otherwise.::

aniso8601.parse_repeating_interval('R3/1981-04-05/P1D', builder=TupleBuilder) RepeatingInterval(R=False, Rnn='3', interval=Interval(start=Date(YYYY='1981', MM='04', DD='05', Www=None, D=None, DDD=None), end=None, duration=Duration(PnY=None, PnM=None, PnW=None, PnD='1', TnH=None, TnM=None, TnS=None))) aniso8601.parse_repeating_interval('R/PT1H2M/1980-03-05T01:01:00', builder=TupleBuilder) RepeatingInterval(R=True, Rnn=None, interval=Interval(start=None, end=Datetime(date=Date(YYYY='1980', MM='03', DD='05', Www=None, D=None, DDD=None), time=Time(hh='01', mm='01', ss='00', tz=None)), duration=Duration(PnY=None, PnM=None, PnW=None, PnD=None, TnH='1', TnM='2', TnS=None)))

Development

Setup

It is recommended to develop using a virtualenv <https://virtualenv.pypa.io/en/stable/>_.

Inside a virtualenv, development dependencies can be installed automatically::

$ pip install -e .[dev]

pre-commit <https://pre-commit.com/>_ is used for managing pre-commit hooks::

$ pre-commit install

To run the pre-commit hooks manually::

$ pre-commit run --all-files

Tests

Tests can be run using the unittest testing framework <https://docs.python.org/3/library/unittest.html>_::

$ python -m unittest discover aniso8601

Contributing

aniso8601 is an open source project hosted on Codeberg <https://codeberg.org/nielsenb-jf/aniso8601>_.

Any and all bugs are welcome on our issue tracker <https://codeberg.org/nielsenb-jf/aniso8601/issues>_. Of particular interest are valid ISO 8601 strings that don't parse, or invalid ones that do. At a minimum, bug reports should include an example of the misbehaving string, as well as the expected result. Of course patches containing unit tests (or fixed bugs) are welcome!

References

  • ISO 8601:2004(E) <http://dotat.at/tmp/ISO_8601-2004_E.pdf>_ (Caution, PDF link)
  • Wikipedia article on ISO 8601 <http://en.wikipedia.org/wiki/Iso8601>_
  • Discussion on alternative ISO 8601 parsers for Python <https://groups.google.com/forum/#!topic/comp.lang.python/Q2w4R89Nq1w>_
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Brandon Nielsen
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10.0.1 2026-02-24