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Description:

isodate2 0.9.0

ISO 8601 date/time parser

isodate2 is a fork of isodate
This module implements ISO 8601 date, time and duration parsing.
The implementation follows ISO8601:2004 standard, and implements only
date/time representations mentioned in the standard. If something is not
mentioned there, then it is treated as non-existent, and not as an allowed
option.
For instance, ISO8601:2004 never mentions 2 digit years. So, it is not
intended by this module to support 2 digit years. (while it may still
be valid as ISO date, because it is not explicitly forbidden.)
Another example is, when no time zone information is given for a time,
then it should be interpreted as local time, and not UTC.
As this module maps ISO 8601 dates/times to standard Python data types, like
date, time, datetime and timedelta, it is not possible to convert
all possible ISO 8601 dates/times. For instance, dates before 0001-01-01 are
not allowed by the Python date and datetime classes. Additionally
fractional seconds are limited to microseconds. That means if the parser finds
for instance nanoseconds it will round it to microseconds.
Documentation
There are five parsing methods available.

parse_time:
parses an ISO 8601 time string into a time object
parse_date:
parses an ISO 8601 date string into a date object
parse_datetime:
parses an ISO 8601 date-time string into a datetime object
parse_duration:
parses an ISO 8601 duration string into a timedelta or Duration
object.
parse_tzinfo:
parses the time zone info part of an ISO 8601 string into a
tzinfo object.

As ISO 8601 allows to define durations in years and months, and timedelta
does not handle years and months, this module provides a Duration class,
which can be used almost like a timedelta object (with some limitations).
However, a Duration object can be converted into a timedelta object.
There are also ISO formatting methods for all supported data types. Each
xxx_isoformat method accepts a format parameter. The default format is
always the ISO 8601 expanded format. This is the same format used by
datetime.isoformat:

time_isoformat:
Intended to create ISO time strings with default format
hh:mm:ssZ.
date_isoformat:
Intended to create ISO date strings with default format
yyyy-mm-dd.
datetime_isoformat:
Intended to create ISO date-time strings with default format
yyyy-mm-ddThh:mm:ssZ.
duration_isoformat:
Intended to create ISO duration strings with default format
PnnYnnMnnDTnnHnnMnnS.
tz_isoformat:
Intended to create ISO time zone strings with default format
hh:mm.
strftime:
A re-implementation mostly compatible with Python's strftime, but
supports only those format strings, which can also be used for dates
prior 1900. This method also understands how to format datetime and
Duration instances.

Installation
python -m pip install isodate2

Limitations

The parser accepts several date/time representation which should be invalid
according to ISO 8601 standard.

for date and time together, this parser accepts a mixture of basic and extended format.
e.g. the date could be in basic format, while the time is accepted in extended format.
It also allows short dates and times in date-time strings.
For incomplete dates, the first day is chosen. e.g. 19th century results in a date of
1901-01-01.
negative Duration and timedelta value are not fully supported yet.

Further information
The doc strings and unit tests should provide rather detailed information about
the methods and their limitations.
The source release provides a setup.py script,
which can be used to run the unit tests included.
Source code is available at https://github.com/isodate/isodate.
See also
isoduration is a well-maintained library which
aims to improve upon isodate:

The state of the art of ISO 8601 duration handling in Python is more or less limited
to what's offered by isodate. What we are
trying to achieve here is to address the shortcomings of isodate (as described in
their own Limitations section), and
a few of our own annoyances with their interface, such as the lack of uniformity in
their handling of types, and the use of regular expressions for parsing.