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<h1><a href="../../../index.html">Django 1.8.19 documentation</a></h1>
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<h1>Source code for django.utils.dateparse</h1><div class="highlight"><pre>
<span></span><span class="sd">"""Functions to parse datetime objects."""</span>
<span class="c1"># We're using regular expressions rather than time.strptime because:</span>
<span class="c1"># - They provide both validation and parsing.</span>
<span class="c1"># - They're more flexible for datetimes.</span>
<span class="c1"># - The date/datetime/time constructors produce friendlier error messages.</span>
<span class="kn">import</span> <span class="nn">datetime</span>
<span class="kn">import</span> <span class="nn">re</span>
<span class="kn">from</span> <span class="nn">django.utils</span> <span class="k">import</span> <span class="n">six</span>
<span class="kn">from</span> <span class="nn">django.utils.timezone</span> <span class="k">import</span> <span class="n">get_fixed_timezone</span><span class="p">,</span> <span class="n">utc</span>
<span class="n">date_re</span> <span class="o">=</span> <span class="n">re</span><span class="o">.</span><span class="n">compile</span><span class="p">(</span>
<span class="s1">r'(?P<year>\d</span><span class="si">{4}</span><span class="s1">)-(?P<month>\d{1,2})-(?P<day>\d{1,2})$'</span>
<span class="p">)</span>
<span class="n">time_re</span> <span class="o">=</span> <span class="n">re</span><span class="o">.</span><span class="n">compile</span><span class="p">(</span>
<span class="s1">r'(?P<hour>\d{1,2}):(?P<minute>\d{1,2})'</span>
<span class="s1">r'(?::(?P<second>\d{1,2})(?:\.(?P<microsecond>\d{1,6})\d{0,6})?)?'</span>
<span class="p">)</span>
<span class="n">datetime_re</span> <span class="o">=</span> <span class="n">re</span><span class="o">.</span><span class="n">compile</span><span class="p">(</span>
<span class="s1">r'(?P<year>\d</span><span class="si">{4}</span><span class="s1">)-(?P<month>\d{1,2})-(?P<day>\d{1,2})'</span>
<span class="s1">r'[T ](?P<hour>\d{1,2}):(?P<minute>\d{1,2})'</span>
<span class="s1">r'(?::(?P<second>\d{1,2})(?:\.(?P<microsecond>\d{1,6})\d{0,6})?)?'</span>
<span class="s1">r'(?P<tzinfo>Z|[+-]\d</span><span class="si">{2}</span><span class="s1">(?::?\d</span><span class="si">{2}</span><span class="s1">)?)?$'</span>
<span class="p">)</span>
<span class="n">standard_duration_re</span> <span class="o">=</span> <span class="n">re</span><span class="o">.</span><span class="n">compile</span><span class="p">(</span>
<span class="s1">r'^'</span>
<span class="s1">r'(?:(?P<days>-?\d+) (days?, )?)?'</span>
<span class="s1">r'((?:(?P<hours>\d+):)(?=\d+:\d+))?'</span>
<span class="s1">r'(?:(?P<minutes>\d+):)?'</span>
<span class="s1">r'(?P<seconds>\d+)'</span>
<span class="s1">r'(?:\.(?P<microseconds>\d{1,6})\d{0,6})?'</span>
<span class="s1">r'$'</span>
<span class="p">)</span>
<span class="c1"># Support the sections of ISO 8601 date representation that are accepted by</span>
<span class="c1"># timedelta</span>
<span class="n">iso8601_duration_re</span> <span class="o">=</span> <span class="n">re</span><span class="o">.</span><span class="n">compile</span><span class="p">(</span>
<span class="s1">r'^P'</span>
<span class="s1">r'(?:(?P<days>\d+(.\d+)?)D)?'</span>
<span class="s1">r'(?:T'</span>
<span class="s1">r'(?:(?P<hours>\d+(.\d+)?)H)?'</span>
<span class="s1">r'(?:(?P<minutes>\d+(.\d+)?)M)?'</span>
<span class="s1">r'(?:(?P<seconds>\d+(.\d+)?)S)?'</span>
<span class="s1">r')?'</span>
<span class="s1">r'$'</span>
<span class="p">)</span>
<div class="viewcode-block" id="parse_date"><a class="viewcode-back" href="../../../ref/utils.html#django.utils.dateparse.parse_date">[docs]</a><span class="k">def</span> <span class="nf">parse_date</span><span class="p">(</span><span class="n">value</span><span class="p">):</span>
<span class="sd">"""Parses a string and return a datetime.date.</span>
<span class="sd"> Raises ValueError if the input is well formatted but not a valid date.</span>
<span class="sd"> Returns None if the input isn't well formatted.</span>
<span class="sd"> """</span>
<span class="n">match</span> <span class="o">=</span> <span class="n">date_re</span><span class="o">.</span><span class="n">match</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="k">if</span> <span class="n">match</span><span class="p">:</span>
<span class="n">kw</span> <span class="o">=</span> <span class="p">{</span><span class="n">k</span><span class="p">:</span> <span class="nb">int</span><span class="p">(</span><span class="n">v</span><span class="p">)</span> <span class="k">for</span> <span class="n">k</span><span class="p">,</span> <span class="n">v</span> <span class="ow">in</span> <span class="n">six</span><span class="o">.</span><span class="n">iteritems</span><span class="p">(</span><span class="n">match</span><span class="o">.</span><span class="n">groupdict</span><span class="p">())}</span>
<span class="k">return</span> <span class="n">datetime</span><span class="o">.</span><span class="n">date</span><span class="p">(</span><span class="o">**</span><span class="n">kw</span><span class="p">)</span></div>
<div class="viewcode-block" id="parse_time"><a class="viewcode-back" href="../../../ref/utils.html#django.utils.dateparse.parse_time">[docs]</a><span class="k">def</span> <span class="nf">parse_time</span><span class="p">(</span><span class="n">value</span><span class="p">):</span>
<span class="sd">"""Parses a string and return a datetime.time.</span>
<span class="sd"> This function doesn't support time zone offsets.</span>
<span class="sd"> Raises ValueError if the input is well formatted but not a valid time.</span>
<span class="sd"> Returns None if the input isn't well formatted, in particular if it</span>
<span class="sd"> contains an offset.</span>
<span class="sd"> """</span>
<span class="n">match</span> <span class="o">=</span> <span class="n">time_re</span><span class="o">.</span><span class="n">match</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="k">if</span> <span class="n">match</span><span class="p">:</span>
<span class="n">kw</span> <span class="o">=</span> <span class="n">match</span><span class="o">.</span><span class="n">groupdict</span><span class="p">()</span>
<span class="k">if</span> <span class="n">kw</span><span class="p">[</span><span class="s1">'microsecond'</span><span class="p">]:</span>
<span class="n">kw</span><span class="p">[</span><span class="s1">'microsecond'</span><span class="p">]</span> <span class="o">=</span> <span class="n">kw</span><span class="p">[</span><span class="s1">'microsecond'</span><span class="p">]</span><span class="o">.</span><span class="n">ljust</span><span class="p">(</span><span class="mi">6</span><span class="p">,</span> <span class="s1">'0'</span><span class="p">)</span>
<span class="n">kw</span> <span class="o">=</span> <span class="p">{</span><span class="n">k</span><span class="p">:</span> <span class="nb">int</span><span class="p">(</span><span class="n">v</span><span class="p">)</span> <span class="k">for</span> <span class="n">k</span><span class="p">,</span> <span class="n">v</span> <span class="ow">in</span> <span class="n">six</span><span class="o">.</span><span class="n">iteritems</span><span class="p">(</span><span class="n">kw</span><span class="p">)</span> <span class="k">if</span> <span class="n">v</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">}</span>
<span class="k">return</span> <span class="n">datetime</span><span class="o">.</span><span class="n">time</span><span class="p">(</span><span class="o">**</span><span class="n">kw</span><span class="p">)</span></div>
<div class="viewcode-block" id="parse_datetime"><a class="viewcode-back" href="../../../ref/utils.html#django.utils.dateparse.parse_datetime">[docs]</a><span class="k">def</span> <span class="nf">parse_datetime</span><span class="p">(</span><span class="n">value</span><span class="p">):</span>
<span class="sd">"""Parses a string and return a datetime.datetime.</span>
<span class="sd"> This function supports time zone offsets. When the input contains one,</span>
<span class="sd"> the output uses a timezone with a fixed offset from UTC.</span>
<span class="sd"> Raises ValueError if the input is well formatted but not a valid datetime.</span>
<span class="sd"> Returns None if the input isn't well formatted.</span>
<span class="sd"> """</span>
<span class="n">match</span> <span class="o">=</span> <span class="n">datetime_re</span><span class="o">.</span><span class="n">match</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="k">if</span> <span class="n">match</span><span class="p">:</span>
<span class="n">kw</span> <span class="o">=</span> <span class="n">match</span><span class="o">.</span><span class="n">groupdict</span><span class="p">()</span>
<span class="k">if</span> <span class="n">kw</span><span class="p">[</span><span class="s1">'microsecond'</span><span class="p">]:</span>
<span class="n">kw</span><span class="p">[</span><span class="s1">'microsecond'</span><span class="p">]</span> <span class="o">=</span> <span class="n">kw</span><span class="p">[</span><span class="s1">'microsecond'</span><span class="p">]</span><span class="o">.</span><span class="n">ljust</span><span class="p">(</span><span class="mi">6</span><span class="p">,</span> <span class="s1">'0'</span><span class="p">)</span>
<span class="n">tzinfo</span> <span class="o">=</span> <span class="n">kw</span><span class="o">.</span><span class="n">pop</span><span class="p">(</span><span class="s1">'tzinfo'</span><span class="p">)</span>
<span class="k">if</span> <span class="n">tzinfo</span> <span class="o">==</span> <span class="s1">'Z'</span><span class="p">:</span>
<span class="n">tzinfo</span> <span class="o">=</span> <span class="n">utc</span>
<span class="k">elif</span> <span class="n">tzinfo</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">offset_mins</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="n">tzinfo</span><span class="p">[</span><span class="o">-</span><span class="mi">2</span><span class="p">:])</span> <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">tzinfo</span><span class="p">)</span> <span class="o">></span> <span class="mi">3</span> <span class="k">else</span> <span class="mi">0</span>
<span class="n">offset</span> <span class="o">=</span> <span class="mi">60</span> <span class="o">*</span> <span class="nb">int</span><span class="p">(</span><span class="n">tzinfo</span><span class="p">[</span><span class="mi">1</span><span class="p">:</span><span class="mi">3</span><span class="p">])</span> <span class="o">+</span> <span class="n">offset_mins</span>
<span class="k">if</span> <span class="n">tzinfo</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">==</span> <span class="s1">'-'</span><span class="p">:</span>
<span class="n">offset</span> <span class="o">=</span> <span class="o">-</span><span class="n">offset</span>
<span class="n">tzinfo</span> <span class="o">=</span> <span class="n">get_fixed_timezone</span><span class="p">(</span><span class="n">offset</span><span class="p">)</span>
<span class="n">kw</span> <span class="o">=</span> <span class="p">{</span><span class="n">k</span><span class="p">:</span> <span class="nb">int</span><span class="p">(</span><span class="n">v</span><span class="p">)</span> <span class="k">for</span> <span class="n">k</span><span class="p">,</span> <span class="n">v</span> <span class="ow">in</span> <span class="n">six</span><span class="o">.</span><span class="n">iteritems</span><span class="p">(</span><span class="n">kw</span><span class="p">)</span> <span class="k">if</span> <span class="n">v</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">}</span>
<span class="n">kw</span><span class="p">[</span><span class="s1">'tzinfo'</span><span class="p">]</span> <span class="o">=</span> <span class="n">tzinfo</span>
<span class="k">return</span> <span class="n">datetime</span><span class="o">.</span><span class="n">datetime</span><span class="p">(</span><span class="o">**</span><span class="n">kw</span><span class="p">)</span></div>
<div class="viewcode-block" id="parse_duration"><a class="viewcode-back" href="../../../ref/utils.html#django.utils.dateparse.parse_duration">[docs]</a><span class="k">def</span> <span class="nf">parse_duration</span><span class="p">(</span><span class="n">value</span><span class="p">):</span>
<span class="sd">"""Parses a duration string and returns a datetime.timedelta.</span>
<span class="sd"> The preferred format for durations in Django is '%d %H:%M:%S.%f'.</span>
<span class="sd"> Also supports ISO 8601 representation.</span>
<span class="sd"> """</span>
<span class="n">match</span> <span class="o">=</span> <span class="n">standard_duration_re</span><span class="o">.</span><span class="n">match</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">match</span><span class="p">:</span>
<span class="n">match</span> <span class="o">=</span> <span class="n">iso8601_duration_re</span><span class="o">.</span><span class="n">match</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="k">if</span> <span class="n">match</span><span class="p">:</span>
<span class="n">kw</span> <span class="o">=</span> <span class="n">match</span><span class="o">.</span><span class="n">groupdict</span><span class="p">()</span>
<span class="k">if</span> <span class="n">kw</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'microseconds'</span><span class="p">):</span>
<span class="n">kw</span><span class="p">[</span><span class="s1">'microseconds'</span><span class="p">]</span> <span class="o">=</span> <span class="n">kw</span><span class="p">[</span><span class="s1">'microseconds'</span><span class="p">]</span><span class="o">.</span><span class="n">ljust</span><span class="p">(</span><span class="mi">6</span><span class="p">,</span> <span class="s1">'0'</span><span class="p">)</span>
<span class="n">kw</span> <span class="o">=</span> <span class="p">{</span><span class="n">k</span><span class="p">:</span> <span class="nb">float</span><span class="p">(</span><span class="n">v</span><span class="p">)</span> <span class="k">for</span> <span class="n">k</span><span class="p">,</span> <span class="n">v</span> <span class="ow">in</span> <span class="n">six</span><span class="o">.</span><span class="n">iteritems</span><span class="p">(</span><span class="n">kw</span><span class="p">)</span> <span class="k">if</span> <span class="n">v</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">}</span>
<span class="k">return</span> <span class="n">datetime</span><span class="o">.</span><span class="n">timedelta</span><span class="p">(</span><span class="o">**</span><span class="n">kw</span><span class="p">)</span></div>
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