<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>django.utils.tzinfo — Django 1.6.8 documentation</title> <link rel="stylesheet" href="../../../_static/default.css" type="text/css" /> <link rel="stylesheet" href="../../../_static/pygments.css" type="text/css" /> <script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT: '../../../', VERSION: '1.6.8', COLLAPSE_INDEX: false, FILE_SUFFIX: '.html', HAS_SOURCE: true }; </script> <script type="text/javascript" src="../../../_static/jquery.js"></script> <script type="text/javascript" src="../../../_static/underscore.js"></script> <script type="text/javascript" src="../../../_static/doctools.js"></script> <link rel="top" title="Django 1.6.8 documentation" href="../../../index.html" /> <link rel="up" title="Module code" href="../../index.html" /> <script type="text/javascript" src="../../../templatebuiltins.js"></script> <script type="text/javascript"> (function($) { if (!django_template_builtins) { // templatebuiltins.js missing, do nothing. return; } $(document).ready(function() { // Hyperlink Django template tags and filters var base = "../../../ref/templates/builtins.html"; if (base == "#") { // Special case for builtins.html itself base = ""; } // Tags are keywords, class '.k' $("div.highlight\\-html\\+django span.k").each(function(i, elem) { var tagname = $(elem).text(); if ($.inArray(tagname, django_template_builtins.ttags) != -1) { var fragment = tagname.replace(/_/, '-'); $(elem).html("<a href='" + base + "#" + fragment + "'>" + tagname + "</a>"); } }); // Filters are functions, class '.nf' $("div.highlight\\-html\\+django span.nf").each(function(i, elem) { var filtername = $(elem).text(); if ($.inArray(filtername, django_template_builtins.tfilters) != -1) { var fragment = filtername.replace(/_/, '-'); $(elem).html("<a href='" + base + "#" + fragment + "'>" + filtername + "</a>"); } }); }); })(jQuery); </script> </head> <body> <div class="document"> <div id="custom-doc" class="yui-t6"> <div id="hd"> <h1><a href="../../../index.html">Django 1.6.8 documentation</a></h1> <div id="global-nav"> <a title="Home page" href="../../../index.html">Home</a> | <a title="Table of contents" href="../../../contents.html">Table of contents</a> | <a title="Global index" href="../../../genindex.html">Index</a> | <a title="Module index" href="../../../py-modindex.html">Modules</a> </div> <div class="nav"> <a href="../../index.html" title="Module code" accesskey="U">up</a></div> </div> <div id="bd"> <div id="yui-main"> <div class="yui-b"> <div class="yui-g" id="_modules-django-utils-tzinfo"> <h1>Source code for django.utils.tzinfo</h1><div class="highlight"><pre> <span class="s">"Implementation of tzinfo classes for use with datetime.datetime."</span> <span class="kn">from</span> <span class="nn">__future__</span> <span class="kn">import</span> <span class="n">unicode_literals</span> <span class="kn">import</span> <span class="nn">time</span> <span class="kn">from</span> <span class="nn">datetime</span> <span class="kn">import</span> <span class="n">timedelta</span><span class="p">,</span> <span class="n">tzinfo</span> <span class="kn">from</span> <span class="nn">django.utils.encoding</span> <span class="kn">import</span> <span class="n">force_str</span><span class="p">,</span> <span class="n">force_text</span><span class="p">,</span> <span class="n">DEFAULT_LOCALE_ENCODING</span> <span class="c"># Python's doc say: "A tzinfo subclass must have an __init__() method that can</span> <span class="c"># be called with no arguments". FixedOffset and LocalTimezone don't honor this</span> <span class="c"># requirement. Defining __getinitargs__ is sufficient to fix copy/deepcopy as</span> <span class="c"># well as pickling/unpickling.</span> <div class="viewcode-block" id="FixedOffset"><a class="viewcode-back" href="../../../ref/utils.html#django.utils.tzinfo.FixedOffset">[docs]</a><span class="k">class</span> <span class="nc">FixedOffset</span><span class="p">(</span><span class="n">tzinfo</span><span class="p">):</span> <span class="s">"Fixed offset in minutes east from UTC."</span> <span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">offset</span><span class="p">):</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">offset</span><span class="p">,</span> <span class="n">timedelta</span><span class="p">):</span> <span class="bp">self</span><span class="o">.</span><span class="n">__offset</span> <span class="o">=</span> <span class="n">offset</span> <span class="n">offset</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">__offset</span><span class="o">.</span><span class="n">seconds</span> <span class="o">//</span> <span class="mi">60</span> <span class="k">else</span><span class="p">:</span> <span class="bp">self</span><span class="o">.</span><span class="n">__offset</span> <span class="o">=</span> <span class="n">timedelta</span><span class="p">(</span><span class="n">minutes</span><span class="o">=</span><span class="n">offset</span><span class="p">)</span> <span class="n">sign</span> <span class="o">=</span> <span class="s">'-'</span> <span class="k">if</span> <span class="n">offset</span> <span class="o"><</span> <span class="mi">0</span> <span class="k">else</span> <span class="s">'+'</span> <span class="bp">self</span><span class="o">.</span><span class="n">__name</span> <span class="o">=</span> <span class="s">"</span><span class="si">%s%02d%02d</span><span class="s">"</span> <span class="o">%</span> <span class="p">(</span><span class="n">sign</span><span class="p">,</span> <span class="nb">abs</span><span class="p">(</span><span class="n">offset</span><span class="p">)</span> <span class="o">/</span> <span class="mf">60.</span><span class="p">,</span> <span class="nb">abs</span><span class="p">(</span><span class="n">offset</span><span class="p">)</span> <span class="o">%</span> <span class="mi">60</span><span class="p">)</span> <span class="k">def</span> <span class="nf">__repr__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">__name</span> <span class="k">def</span> <span class="nf">__getinitargs__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">__offset</span><span class="p">,</span> <span class="k">def</span> <span class="nf">utcoffset</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">dt</span><span class="p">):</span> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">__offset</span> <span class="k">def</span> <span class="nf">tzname</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">dt</span><span class="p">):</span> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">__name</span> <span class="k">def</span> <span class="nf">dst</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">dt</span><span class="p">):</span> <span class="k">return</span> <span class="n">timedelta</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span> <span class="c"># This implementation is used for display purposes. It uses an approximation</span> <span class="c"># for DST computations on dates >= 2038.</span> <span class="c"># A similar implementation exists in django.utils.timezone. It's used for</span> <span class="c"># timezone support (when USE_TZ = True) and focuses on correctness.</span> </div> <div class="viewcode-block" id="LocalTimezone"><a class="viewcode-back" href="../../../ref/utils.html#django.utils.tzinfo.LocalTimezone">[docs]</a><span class="k">class</span> <span class="nc">LocalTimezone</span><span class="p">(</span><span class="n">tzinfo</span><span class="p">):</span> <span class="s">"Proxy timezone information from time module."</span> <span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">dt</span><span class="p">):</span> <span class="n">tzinfo</span><span class="o">.</span><span class="n">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="bp">self</span><span class="o">.</span><span class="n">__dt</span> <span class="o">=</span> <span class="n">dt</span> <span class="bp">self</span><span class="o">.</span><span class="n">_tzname</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">tzname</span><span class="p">(</span><span class="n">dt</span><span class="p">)</span> <span class="k">def</span> <span class="nf">__repr__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="k">return</span> <span class="n">force_str</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_tzname</span><span class="p">)</span> <span class="k">def</span> <span class="nf">__getinitargs__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">__dt</span><span class="p">,</span> <span class="k">def</span> <span class="nf">utcoffset</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">dt</span><span class="p">):</span> <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_isdst</span><span class="p">(</span><span class="n">dt</span><span class="p">):</span> <span class="k">return</span> <span class="n">timedelta</span><span class="p">(</span><span class="n">seconds</span><span class="o">=-</span><span class="n">time</span><span class="o">.</span><span class="n">altzone</span><span class="p">)</span> <span class="k">else</span><span class="p">:</span> <span class="k">return</span> <span class="n">timedelta</span><span class="p">(</span><span class="n">seconds</span><span class="o">=-</span><span class="n">time</span><span class="o">.</span><span class="n">timezone</span><span class="p">)</span> <span class="k">def</span> <span class="nf">dst</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">dt</span><span class="p">):</span> <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_isdst</span><span class="p">(</span><span class="n">dt</span><span class="p">):</span> <span class="k">return</span> <span class="n">timedelta</span><span class="p">(</span><span class="n">seconds</span><span class="o">=-</span><span class="n">time</span><span class="o">.</span><span class="n">altzone</span><span class="p">)</span> <span class="o">-</span> <span class="n">timedelta</span><span class="p">(</span><span class="n">seconds</span><span class="o">=-</span><span class="n">time</span><span class="o">.</span><span class="n">timezone</span><span class="p">)</span> <span class="k">else</span><span class="p">:</span> <span class="k">return</span> <span class="n">timedelta</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span> <span class="k">def</span> <span class="nf">tzname</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">dt</span><span class="p">):</span> <span class="n">is_dst</span> <span class="o">=</span> <span class="bp">False</span> <span class="k">if</span> <span class="n">dt</span> <span class="ow">is</span> <span class="bp">None</span> <span class="k">else</span> <span class="bp">self</span><span class="o">.</span><span class="n">_isdst</span><span class="p">(</span><span class="n">dt</span><span class="p">)</span> <span class="k">try</span><span class="p">:</span> <span class="k">return</span> <span class="n">force_text</span><span class="p">(</span><span class="n">time</span><span class="o">.</span><span class="n">tzname</span><span class="p">[</span><span class="n">is_dst</span><span class="p">],</span> <span class="n">DEFAULT_LOCALE_ENCODING</span><span class="p">)</span> <span class="k">except</span> <span class="ne">UnicodeDecodeError</span><span class="p">:</span> <span class="k">return</span> <span class="bp">None</span> <span class="k">def</span> <span class="nf">_isdst</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">dt</span><span class="p">):</span> <span class="n">tt</span> <span class="o">=</span> <span class="p">(</span><span class="n">dt</span><span class="o">.</span><span class="n">year</span><span class="p">,</span> <span class="n">dt</span><span class="o">.</span><span class="n">month</span><span class="p">,</span> <span class="n">dt</span><span class="o">.</span><span class="n">day</span><span class="p">,</span> <span class="n">dt</span><span class="o">.</span><span class="n">hour</span><span class="p">,</span> <span class="n">dt</span><span class="o">.</span><span class="n">minute</span><span class="p">,</span> <span class="n">dt</span><span class="o">.</span><span class="n">second</span><span class="p">,</span> <span class="n">dt</span><span class="o">.</span><span class="n">weekday</span><span class="p">(),</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">)</span> <span class="k">try</span><span class="p">:</span> <span class="n">stamp</span> <span class="o">=</span> <span class="n">time</span><span class="o">.</span><span class="n">mktime</span><span class="p">(</span><span class="n">tt</span><span class="p">)</span> <span class="k">except</span> <span class="p">(</span><span class="ne">OverflowError</span><span class="p">,</span> <span class="ne">ValueError</span><span class="p">):</span> <span class="c"># 32 bit systems can't handle dates after Jan 2038, and certain</span> <span class="c"># systems can't handle dates before ~1901-12-01:</span> <span class="c">#</span> <span class="c"># >>> time.mktime((1900, 1, 13, 0, 0, 0, 0, 0, 0))</span> <span class="c"># OverflowError: mktime argument out of range</span> <span class="c"># >>> time.mktime((1850, 1, 13, 0, 0, 0, 0, 0, 0))</span> <span class="c"># ValueError: year out of range</span> <span class="c">#</span> <span class="c"># In this case, we fake the date, because we only care about the</span> <span class="c"># DST flag.</span> <span class="n">tt</span> <span class="o">=</span> <span class="p">(</span><span class="mi">2037</span><span class="p">,)</span> <span class="o">+</span> <span class="n">tt</span><span class="p">[</span><span class="mi">1</span><span class="p">:]</span> <span class="n">stamp</span> <span class="o">=</span> <span class="n">time</span><span class="o">.</span><span class="n">mktime</span><span class="p">(</span><span class="n">tt</span><span class="p">)</span> <span class="n">tt</span> <span class="o">=</span> <span class="n">time</span><span class="o">.</span><span class="n">localtime</span><span class="p">(</span><span class="n">stamp</span><span class="p">)</span> <span class="k">return</span> <span class="n">tt</span><span class="o">.</span><span class="n">tm_isdst</span> <span class="o">></span> <span class="mi">0</span></div> </pre></div> </div> </div> </div> <div class="yui-b" id="sidebar"> <div class="sphinxsidebar"> <div 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