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<h1>Source code for awips.TimeUtil</h1><div class="highlight"><pre>
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<span></span><span class="c1"># ----------------------------------------------------------------------------</span>
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<span class="c1"># This software is in the public domain, furnished "as is", without technical</span>
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<span class="c1"># support, and with no warranty, express or implied, as to its usefulness for</span>
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<span class="c1"># any purpose.</span>
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<span class="c1">#</span>
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<span class="c1"># offsetTime.py</span>
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<span class="c1"># Handles Displaced Real Time for various applications</span>
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<span class="c1">#</span>
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<span class="c1"># Author: hansen/romberg</span>
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<span class="c1"># ----------------------------------------------------------------------------</span>
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<span class="kn">import</span> <span class="nn">string</span>
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<span class="kn">import</span> <span class="nn">time</span>
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<span class="c1"># Given the timeStr, return the offset (in seconds)</span>
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<span class="c1"># from the current time.</span>
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<span class="c1"># Also return the launchStr i.e. Programs launched from this</span>
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<span class="c1"># offset application will use the launchStr as the -z argument.</span>
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<span class="c1"># The offset will be positive for time in the future,</span>
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<span class="c1"># negative for time in the past.</span>
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<span class="c1">#</span>
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<span class="c1"># May still want it to be normalized to the most recent midnight.</span>
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<span class="c1">#</span>
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<span class="c1"># NOTES about synchronizing:</span>
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<span class="c1"># --With synchronizing on, the "current time" for all processes started</span>
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<span class="c1"># within a given hour will be the same.</span>
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<span class="c1"># This guarantees that GFE's have the same current time and ISC grid</span>
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<span class="c1"># time stamps are syncrhonized and can be exchanged.</span>
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<span class="c1"># Formatters launched from the GFE in this mode will be synchronized as</span>
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<span class="c1"># well by setting the launchStr to use the time difference format</span>
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<span class="c1"># (YYYYMMDD_HHMM,YYYYMMDD_HHMM).</span>
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<span class="c1"># --This does not solve the problem in the general case.</span>
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<span class="c1"># For example, if someone starts the GFE at 12:59 and someone</span>
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<span class="c1"># else starts it at 1:01, they will have different offsets and</span>
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<span class="c1"># current times.</span>
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<span class="c1"># --With synchronizing off, when the process starts, the current time</span>
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<span class="c1"># matches the drtTime in the command line. However, with synchronizing</span>
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<span class="c1"># on, the current time will be offset by the fraction of the hour at</span>
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<span class="c1"># which the process was started. Examples:</span>
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<span class="c1"># Actual Starting time: 20040617_1230</span>
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<span class="c1"># drtTime 20040616_0000</span>
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<span class="c1"># Synchronizing off:</span>
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<span class="c1"># GFE Spatial Editor at StartUp: 20040616_0000</span>
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<span class="c1"># Synchronizing on:</span>
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<span class="c1"># GFE Spatial Editor at StartUp: 20040616_0030</span>
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<span class="c1">#</span>
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<div class="viewcode-block" id="determineDrtOffset"><a class="viewcode-back" href="../../api/TimeUtil.html#awips.TimeUtil.determineDrtOffset">[docs]</a><span class="k">def</span> <span class="nf">determineDrtOffset</span><span class="p">(</span><span class="n">timeStr</span><span class="p">):</span>
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<span class="n">launchStr</span> <span class="o">=</span> <span class="n">timeStr</span>
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<span class="c1"># Check for time difference</span>
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<span class="k">if</span> <span class="n">timeStr</span><span class="o">.</span><span class="n">find</span><span class="p">(</span><span class="s2">","</span><span class="p">)</span> <span class="o">>=</span> <span class="mi">0</span><span class="p">:</span>
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<span class="n">times</span> <span class="o">=</span> <span class="n">timeStr</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s2">","</span><span class="p">)</span>
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<span class="n">t1</span> <span class="o">=</span> <span class="n">makeTime</span><span class="p">(</span><span class="n">times</span><span class="p">[</span><span class="mi">0</span><span class="p">])</span>
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<span class="n">t2</span> <span class="o">=</span> <span class="n">makeTime</span><span class="p">(</span><span class="n">times</span><span class="p">[</span><span class="mi">1</span><span class="p">])</span>
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<span class="k">return</span> <span class="n">t1</span><span class="o">-</span><span class="n">t2</span><span class="p">,</span> <span class="n">launchStr</span>
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<span class="c1"># Check for synchronized mode</span>
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<span class="n">synch</span> <span class="o">=</span> <span class="mi">0</span>
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<span class="k">if</span> <span class="n">timeStr</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">==</span> <span class="s2">"S"</span><span class="p">:</span>
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<span class="n">timeStr</span> <span class="o">=</span> <span class="n">timeStr</span><span class="p">[</span><span class="mi">1</span><span class="p">:]</span>
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<span class="n">synch</span> <span class="o">=</span> <span class="mi">1</span>
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<span class="n">drt_t</span> <span class="o">=</span> <span class="n">makeTime</span><span class="p">(</span><span class="n">timeStr</span><span class="p">)</span>
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<span class="n">gm</span> <span class="o">=</span> <span class="n">time</span><span class="o">.</span><span class="n">gmtime</span><span class="p">()</span>
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<span class="n">cur_t</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">gm</span><span class="p">)</span>
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<span class="c1"># Synchronize to most recent hour</span>
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<span class="c1"># i.e. "truncate" cur_t to most recent hour.</span>
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<span class="k">if</span> <span class="n">synch</span><span class="p">:</span>
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<span class="n">cur_t</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">gm</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="n">gm</span><span class="p">[</span><span class="mi">1</span><span class="p">],</span> <span class="n">gm</span><span class="p">[</span><span class="mi">2</span><span class="p">],</span> <span class="n">gm</span><span class="p">[</span><span class="mi">3</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="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">))</span>
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<span class="n">curStr</span> <span class="o">=</span> <span class="s1">'</span><span class="si">%4s%2s%2s</span><span class="s1">_</span><span class="si">%2s</span><span class="s1">00</span><span class="se">\n</span><span class="s1">'</span> <span class="o">%</span> <span class="p">(</span><span class="nb">repr</span><span class="p">(</span><span class="n">gm</span><span class="p">[</span><span class="mi">0</span><span class="p">]),</span> <span class="nb">repr</span><span class="p">(</span><span class="n">gm</span><span class="p">[</span><span class="mi">1</span><span class="p">]),</span>
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<span class="nb">repr</span><span class="p">(</span><span class="n">gm</span><span class="p">[</span><span class="mi">2</span><span class="p">]),</span> <span class="nb">repr</span><span class="p">(</span><span class="n">gm</span><span class="p">[</span><span class="mi">3</span><span class="p">]))</span>
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<span class="n">curStr</span> <span class="o">=</span> <span class="n">curStr</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="s1">' '</span><span class="p">,</span> <span class="s1">'0'</span><span class="p">)</span>
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<span class="n">launchStr</span> <span class="o">=</span> <span class="n">timeStr</span> <span class="o">+</span> <span class="s2">","</span> <span class="o">+</span> <span class="n">curStr</span>
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<span class="n">offset</span> <span class="o">=</span> <span class="n">drt_t</span> <span class="o">-</span> <span class="n">cur_t</span>
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<span class="k">return</span> <span class="nb">int</span><span class="p">(</span><span class="n">offset</span><span class="p">),</span> <span class="n">launchStr</span></div>
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<div class="viewcode-block" id="makeTime"><a class="viewcode-back" href="../../api/TimeUtil.html#awips.TimeUtil.makeTime">[docs]</a><span class="k">def</span> <span class="nf">makeTime</span><span class="p">(</span><span class="n">timeStr</span><span class="p">):</span>
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<span class="n">year</span> <span class="o">=</span> <span class="n">string</span><span class="o">.</span><span class="n">atoi</span><span class="p">(</span><span class="n">timeStr</span><span class="p">[</span><span class="mi">0</span><span class="p">:</span><span class="mi">4</span><span class="p">])</span>
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<span class="n">month</span> <span class="o">=</span> <span class="n">string</span><span class="o">.</span><span class="n">atoi</span><span class="p">(</span><span class="n">timeStr</span><span class="p">[</span><span class="mi">4</span><span class="p">:</span><span class="mi">6</span><span class="p">])</span>
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<span class="n">day</span> <span class="o">=</span> <span class="n">string</span><span class="o">.</span><span class="n">atoi</span><span class="p">(</span><span class="n">timeStr</span><span class="p">[</span><span class="mi">6</span><span class="p">:</span><span class="mi">8</span><span class="p">])</span>
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<span class="n">hour</span> <span class="o">=</span> <span class="n">string</span><span class="o">.</span><span class="n">atoi</span><span class="p">(</span><span class="n">timeStr</span><span class="p">[</span><span class="mi">9</span><span class="p">:</span><span class="mi">11</span><span class="p">])</span>
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<span class="n">minute</span> <span class="o">=</span> <span class="n">string</span><span class="o">.</span><span class="n">atoi</span><span class="p">(</span><span class="n">timeStr</span><span class="p">[</span><span class="mi">11</span><span class="p">:</span><span class="mi">13</span><span class="p">])</span>
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<span class="c1"># Do not use daylight savings because gmtime is not in daylight</span>
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<span class="c1"># savings time.</span>
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<span class="k">return</span> <span class="n">time</span><span class="o">.</span><span class="n">mktime</span><span class="p">((</span><span class="n">year</span><span class="p">,</span> <span class="n">month</span><span class="p">,</span> <span class="n">day</span><span class="p">,</span> <span class="n">hour</span><span class="p">,</span> <span class="n">minute</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="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">))</span></div>
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