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author shellac
date Mon, 01 Jun 2020 08:59:25 -0400
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2 ISO 8601 date/time parser
3 =========================
4
5 .. image:: https://travis-ci.org/gweis/isodate.svg?branch=master
6 :target: https://travis-ci.org/gweis/isodate
7 :alt: Travis-CI
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9 :target: https://coveralls.io/r/gweis/isodate?branch=master
10 :alt: Coveralls
11 .. image:: https://img.shields.io/pypi/v/isodate.svg
12 :target: https://pypi.python.org/pypi/isodate/
13 :alt: Latest Version
14 .. image:: https://img.shields.io/pypi/l/isodate.svg
15 :target: https://pypi.python.org/pypi/isodate/
16 :alt: License
17
18
19 This module implements ISO 8601 date, time and duration parsing.
20 The implementation follows ISO8601:2004 standard, and implements only
21 date/time representations mentioned in the standard. If something is not
22 mentioned there, then it is treated as non existent, and not as an allowed
23 option.
24
25 For instance, ISO8601:2004 never mentions 2 digit years. So, it is not
26 intended by this module to support 2 digit years. (while it may still
27 be valid as ISO date, because it is not explicitly forbidden.)
28 Another example is, when no time zone information is given for a time,
29 then it should be interpreted as local time, and not UTC.
30
31 As this module maps ISO 8601 dates/times to standard Python data types, like
32 *date*, *time*, *datetime* and *timedelta*, it is not possible to convert
33 all possible ISO 8601 dates/times. For instance, dates before 0001-01-01 are
34 not allowed by the Python *date* and *datetime* classes. Additionally
35 fractional seconds are limited to microseconds. That means if the parser finds
36 for instance nanoseconds it will round it to microseconds.
37
38 Documentation
39 -------------
40
41 Currently there are four parsing methods available.
42 * parse_time:
43 parses an ISO 8601 time string into a *time* object
44 * parse_date:
45 parses an ISO 8601 date string into a *date* object
46 * parse_datetime:
47 parses an ISO 8601 date-time string into a *datetime* object
48 * parse_duration:
49 parses an ISO 8601 duration string into a *timedelta* or *Duration*
50 object.
51 * parse_tzinfo:
52 parses the time zone info part of an ISO 8601 string into a
53 *tzinfo* object.
54
55 As ISO 8601 allows to define durations in years and months, and *timedelta*
56 does not handle years and months, this module provides a *Duration* class,
57 which can be used almost like a *timedelta* object (with some limitations).
58 However, a *Duration* object can be converted into a *timedelta* object.
59
60 There are also ISO formatting methods for all supported data types. Each
61 *xxx_isoformat* method accepts a format parameter. The default format is
62 always the ISO 8601 expanded format. This is the same format used by
63 *datetime.isoformat*:
64
65 * time_isoformat:
66 Intended to create ISO time strings with default format
67 *hh:mm:ssZ*.
68 * date_isoformat:
69 Intended to create ISO date strings with default format
70 *yyyy-mm-dd*.
71 * datetime_isoformat:
72 Intended to create ISO date-time strings with default format
73 *yyyy-mm-ddThh:mm:ssZ*.
74 * duration_isoformat:
75 Intended to create ISO duration strings with default format
76 *PnnYnnMnnDTnnHnnMnnS*.
77 * tz_isoformat:
78 Intended to create ISO time zone strings with default format
79 *hh:mm*.
80 * strftime:
81 A re-implementation mostly compatible with Python's *strftime*, but
82 supports only those format strings, which can also be used for dates
83 prior 1900. This method also understands how to format *datetime* and
84 *Duration* instances.
85
86 Installation:
87 -------------
88
89 This module can easily be installed with Python standard installation methods.
90
91 Either use *python setup.py install* or in case you have *setuptools* or
92 *distribute* available, you can also use *easy_install*.
93
94 Limitations:
95 ------------
96
97 * The parser accepts several date/time representation which should be invalid
98 according to ISO 8601 standard.
99
100 1. for date and time together, this parser accepts a mixture of basic and extended format.
101 e.g. the date could be in basic format, while the time is accepted in extended format.
102 It also allows short dates and times in date-time strings.
103 2. For incomplete dates, the first day is chosen. e.g. 19th century results in a date of
104 1901-01-01.
105 3. negative *Duration* and *timedelta* value are not fully supported yet.
106
107 Further information:
108 --------------------
109
110 The doc strings and unit tests should provide rather detailed information about
111 the methods and their limitations.
112
113 The source release provides a *setup.py* script,
114 which can be used to run the unit tests included.
115
116 Source code is available at `<http://github.com/gweis/isodate>`_.
117
118 CHANGES
119 =======
120
121 0.6.0 (2017-10-13)
122 ------------------
123
124 - support incomplete month date (Fabien Loffredo)
125 - rely on duck typing when doing duration maths
126 - support ':' as separator in fractional time zones (usrenmae)
127
128
129 0.5.4 (2015-08-06)
130 ------------------
131
132 - Fix parsing of Periods (Fabien Bochu)
133 - Make Duration objects hashable (Geoffrey Fairchild)
134 - Add multiplication to duration (Reinoud Elhorst)
135
136
137 0.5.1 (2014-11-07)
138 ------------------
139
140 - fixed pickling of Duration objects
141 - raise ISO8601Error when there is no 'T' separator in datetime strings (Adrian Coveney)
142
143
144 0.5.0 (2014-02-23)
145 ------------------
146
147 - ISO8601Error are subclasses of ValueError now (Michael Hrivnak)
148 - improve compatibility across various python variants and versions
149 - raise exceptions when using fractional years and months in date
150 maths with durations
151 - renamed method todatetime on Duraction objects to totimedelta
152
153
154 0.4.9 (2012-10-30)
155 ------------------
156
157 - support pickling FixedOffset instances
158 - make sure parsed fractional seconds are in microseconds
159 - add leading zeros when formattig microseconds (Jarom Loveridge)
160
161
162 0.4.8 (2012-05-04)
163 ------------------
164
165 - fixed incompatibility of unittests with python 2.5 and 2.6 (runs fine on 2.7
166 and 3.2)
167
168
169 0.4.7 (2012-01-26)
170 ------------------
171
172 - fixed tzinfo formatting (never pass None into tzinfo.utcoffset())
173
174
175 0.4.6 (2012-01-06)
176 ------------------
177
178 - added Python 3 compatibility via 2to3
179
180 0.4.5 (2012-01-06)
181 ------------------
182
183 - made setuptools dependency optional
184
185 0.4.4 (2011-04-16)
186 ------------------
187
188 - Fixed formatting of microseconds for datetime objects
189
190 0.4.3 (2010-10-29)
191 ------------------
192
193 - Fixed problem with %P formating and fractions (supplied by David Brooks)
194
195 0.4.2 (2010-10-28)
196 ------------------
197
198 - Implemented unary - for Duration (supplied by David Brooks)
199 - Output fractional seconds with '%P' format. (partly supplied by David Brooks)
200
201 0.4.1 (2010-10-13)
202 ------------------
203
204 - fixed bug in comparison between timedelta and Duration.
205 - fixed precision problem with microseconds (reported by Tommi Virtanen)
206
207 0.4.0 (2009-02-09)
208 ------------------
209
210 - added method to parse ISO 8601 time zone strings
211 - added methods to create ISO 8601 conforming strings
212
213 0.3.0 (2009-1-05)
214 ------------------
215
216 - Initial release
217
218 TODOs
219 =====
220
221 This to do list contains some thoughts and ideas about missing features, and
222 parts to think about, whether to implement them or not. This list is probably
223 not complete.
224
225 Missing features:
226 -----------------
227
228 * time formating does not allow to create fractional representations.
229 * parser for ISO intervals.
230 * currently microseconds are always padded to a length of 6 characters.
231 trailing 0s should be optional
232
233 Documentation:
234 --------------
235
236 * parse_datetime:
237 - complete documentation to show what this function allows, but ISO forbids.
238 and vice verse.
239 - support other separators between date and time than 'T'
240
241 * parse_date:
242 - yeardigits should be always greater than 4
243 - dates before 0001-01-01 are not supported
244
245 * parse_duration:
246 - alternative formats are not fully supported due to parse_date restrictions
247 - standard duration format is fully supported but not very restrictive.
248
249 * Duration:
250 - support fractional years and month in calculations
251 - implement w3c order relation? (`<http://www.w3.org/TR/xmlschema-2/#duration-order>`_)
252 - refactor to have duration mathematics only at one place.
253 - localize __str__ method (does timedelta do this?)
254 - when is a Duration negative?
255 - normalize Durations. months [00-12] and years ]-inf,+inf[
256
257