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<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>
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