aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/python/python-dateutil/README.rst
blob: 106023b32410c5e8bf6dbdc8d96fe5a47e86cc35 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
dateutil - powerful extensions to datetime
==========================================

|pypi| |support| |licence|

|gitter| |readthedocs|

|travis| |appveyor| |pipelines| |coverage|

.. |pypi| image:: https://img.shields.io/pypi/v/python-dateutil.svg?style=flat-square
    :target: https://pypi.org/project/python-dateutil/
    :alt: pypi version

.. |support| image:: https://img.shields.io/pypi/pyversions/python-dateutil.svg?style=flat-square
    :target: https://pypi.org/project/python-dateutil/
    :alt: supported Python version

.. |travis| image:: https://img.shields.io/travis/dateutil/dateutil/master.svg?style=flat-square&label=Travis%20Build
    :target: https://travis-ci.org/dateutil/dateutil
    :alt: travis build status

.. |appveyor| image:: https://img.shields.io/appveyor/ci/dateutil/dateutil/master.svg?style=flat-square&logo=appveyor
    :target: https://ci.appveyor.com/project/dateutil/dateutil
    :alt: appveyor build status

.. |pipelines| image:: https://dev.azure.com/pythondateutilazure/dateutil/_apis/build/status/dateutil.dateutil?branchName=master
    :target: https://dev.azure.com/pythondateutilazure/dateutil/_build/latest?definitionId=1&branchName=master
    :alt: azure pipelines build status

.. |coverage| image:: https://codecov.io/gh/dateutil/dateutil/branch/master/graphs/badge.svg?branch=master
    :target: https://codecov.io/gh/dateutil/dateutil?branch=master
    :alt: Code coverage

.. |gitter| image:: https://badges.gitter.im/dateutil/dateutil.svg
   :alt: Join the chat at https://gitter.im/dateutil/dateutil
   :target: https://gitter.im/dateutil/dateutil

.. |licence| image:: https://img.shields.io/pypi/l/python-dateutil.svg?style=flat-square
    :target: https://pypi.org/project/python-dateutil/
    :alt: licence

.. |readthedocs| image:: https://img.shields.io/readthedocs/dateutil/latest.svg?style=flat-square&label=Read%20the%20Docs
   :alt: Read the documentation at https://dateutil.readthedocs.io/en/latest/
   :target: https://dateutil.readthedocs.io/en/latest/

The `dateutil` module provides powerful extensions to
the standard `datetime` module, available in Python.

Installation
============
`dateutil` can be installed from PyPI using `pip` (note that the package name is
different from the importable name)::

    pip install python-dateutil

Download
========
dateutil is available on PyPI
https://pypi.org/project/python-dateutil/

The documentation is hosted at:
https://dateutil.readthedocs.io/en/stable/

Code
====
The code and issue tracker are hosted on GitHub:
https://github.com/dateutil/dateutil/

Features
========

* Computing of relative deltas (next month, next year,
  next Monday, last week of month, etc);
* Computing of relative deltas between two given
  date and/or datetime objects;
* Computing of dates based on very flexible recurrence rules,
  using a superset of the `iCalendar <https://www.ietf.org/rfc/rfc2445.txt>`_
  specification. Parsing of RFC strings is supported as well.
* Generic parsing of dates in almost any string format;
* Timezone (tzinfo) implementations for tzfile(5) format
  files (/etc/localtime, /usr/share/zoneinfo, etc), TZ
  environment string (in all known formats), iCalendar
  format files, given ranges (with help from relative deltas),
  local machine timezone, fixed offset timezone, UTC timezone,
  and Windows registry-based time zones.
* Internal up-to-date world timezone information based on
  Olson's database.
* Computing of Easter Sunday dates for any given year,
  using Western, Orthodox or Julian algorithms;
* A comprehensive test suite.

Quick example
=============
Here's a snapshot, just to give an idea about the power of the
package. For more examples, look at the documentation.

Suppose you want to know how much time is left, in
years/months/days/etc, before the next easter happening on a
year with a Friday 13th in August, and you want to get today's
date out of the "date" unix system command. Here is the code:

.. doctest:: readmeexample

    >>> from dateutil.relativedelta import *
    >>> from dateutil.easter import *
    >>> from dateutil.rrule import *
    >>> from dateutil.parser import *
    >>> from datetime import *
    >>> now = parse("Sat Oct 11 17:13:46 UTC 2003")
    >>> today = now.date()
    >>> year = rrule(YEARLY,dtstart=now,bymonth=8,bymonthday=13,byweekday=FR)[0].year
    >>> rdelta = relativedelta(easter(year), today)
    >>> print("Today is: %s" % today)
    Today is: 2003-10-11
    >>> print("Year with next Aug 13th on a Friday is: %s" % year)
    Year with next Aug 13th on a Friday is: 2004
    >>> print("How far is the Easter of that year: %s" % rdelta)
    How far is the Easter of that year: relativedelta(months=+6)
    >>> print("And the Easter of that year is: %s" % (today+rdelta))
    And the Easter of that year is: 2004-04-11

Being exactly 6 months ahead was **really** a coincidence :)

Contributing
============

We welcome many types of contributions - bug reports, pull requests (code, infrastructure or documentation fixes). For more information about how to contribute to the project, see the ``CONTRIBUTING.md`` file in the repository.


Author
======
The dateutil module was written by Gustavo Niemeyer <gustavo@niemeyer.net>
in 2003.

It is maintained by:

* Gustavo Niemeyer <gustavo@niemeyer.net> 2003-2011
* Tomi Pieviläinen <tomi.pievilainen@iki.fi> 2012-2014
* Yaron de Leeuw <me@jarondl.net> 2014-2016
* Paul Ganssle <paul@ganssle.io> 2015-

Starting with version 2.4.1 and running until 2.8.2, all source and binary
distributions will be signed by a PGP key that has, at the very least, been
signed by the key which made the previous release. A table of release signing
keys can be found below:

===========  ============================
Releases     Signing key fingerprint
===========  ============================
2.4.1-2.8.2  `6B49 ACBA DCF6 BD1C A206 67AB CD54 FCE3 D964 BEFB`_ 
===========  ============================

New releases *may* have signed tags, but binary and source distributions
uploaded to PyPI will no longer have GPG signatures attached.

Contact
=======
Our mailing list is available at `dateutil@python.org <https://mail.python.org/mailman/listinfo/dateutil>`_. As it is hosted by the PSF, it is subject to the `PSF code of
conduct <https://www.python.org/psf/conduct/>`_.

License
=======

All contributions after December 1, 2017 released under dual license - either `Apache 2.0 License <https://www.apache.org/licenses/LICENSE-2.0>`_ or the `BSD 3-Clause License <https://opensource.org/licenses/BSD-3-Clause>`_. Contributions before December 1, 2017 - except those those explicitly relicensed - are released only under the BSD 3-Clause License.


.. _6B49 ACBA DCF6 BD1C A206 67AB CD54 FCE3 D964 BEFB:
   https://pgp.mit.edu/pks/lookup?op=vindex&search=0xCD54FCE3D964BEFB