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python-cheatsheet
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Datetime

pull/135/head
Jure Šorn 2 years ago
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  1. 8
      README.md
  2. 12
      index.html

8
README.md
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@ -604,7 +604,7 @@ from dateutil.tz import UTC, tzlocal, gettz, datetime_exists, resolve_imaginary
<DT> = datetime(year, month, day, hour=0, minute=0, second=0, ...)
<TD> = timedelta(weeks=0, days=0, hours=0, minutes=0, seconds=0, ...)
```
* **Use `'<D/DT>.weekday()'` to get the day of the week (Mon == 0).**
* **Use `'<D/DT>.weekday()'` to get the day of the week as an int, with Monday being 0.**
* **`'fold=1'` means the second pass in case of time jumping back for one hour.**
* **Timedelta normalizes arguments to ±days, seconds (< 86 400) and microseconds (< 1M).**
@ -633,16 +633,16 @@ from dateutil.tz import UTC, tzlocal, gettz, datetime_exists, resolve_imaginary
<DTn> = DT.fromtimestamp(<real>) # Local time DTn from seconds since the Epoch.
<DTa> = DT.fromtimestamp(<real>, <tz.>) # Aware datetime from seconds since the Epoch.
```
* **ISO strings come in following forms: `'YYYY-MM-DD'`, `'HH:MM:SS.ffffff[±<offset>]'`, or both separated by an arbitrary character. Offset is formatted as: `'HH:MM'`.**
* **ISO strings come in following forms: `'YYYY-MM-DD'`, `'HH:MM:SS.mmmuuu[±HH:MM]'`, or both separated by an arbitrary character. All parts following hours are optional.**
* **Python uses the Unix Epoch: `'1970-01-01 00:00 UTC'`, `'1970-01-01 01:00 CET'`, ...**
### Decode
```python
<str> = <D/T/DT>.isoformat(sep='T') # Also timespec='auto/hours/minutes/seconds'.
<str> = <D/T/DT>.isoformat(sep='T') # Also timespec='auto/hours/minutes/seconds/…'.
<str> = <D/T/DT>.strftime('<format>') # Custom string representation.
<int> = <D/DT>.toordinal() # Days since Gregorian NYE 1, ignoring time and tz.
<float> = <DTn>.timestamp() # Seconds since the Epoch, from DTn in local tz.
<float> = <DTa>.timestamp() # Seconds since the Epoch, from DTa.
<float> = <DTa>.timestamp() # Seconds since the Epoch, from aware datetime.
```
### Format

12
index.html
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@ -54,7 +54,7 @@
<body>
<header>
<aside>June 7, 2022</aside>
<aside>June 10, 2022</aside>
<a href="https://gto76.github.io" rel="author">Jure Šorn</a>
</header>
@ -536,7 +536,7 @@ to_exclusive = &lt;range&gt;.stop
</code></pre></div>
<ul>
<li><strong>Use <code class="python hljs"><span class="hljs-string">'&lt;D/DT&gt;.weekday()'</span></code> to get the day of the week (Mon == 0).</strong></li>
<li><strong>Use <code class="python hljs"><span class="hljs-string">'&lt;D/DT&gt;.weekday()'</span></code> to get the day of the week as an int, with Monday being 0.</strong></li>
<li><strong><code class="python hljs"><span class="hljs-string">'fold=1'</span></code> means the second pass in case of time jumping back for one hour.</strong></li>
<li><strong>Timedelta normalizes arguments to ±days, seconds (&lt; 86 400) and microseconds (&lt; 1M).</strong></li>
</ul>
@ -563,14 +563,14 @@ to_exclusive = &lt;range&gt;.stop
</code></pre></div>
<ul>
<li><strong>ISO strings come in following forms: <code class="python hljs"><span class="hljs-string">'YYYY-MM-DD'</span></code>, <code class="python hljs"><span class="hljs-string">'HH:MM:SS.ffffff[±&lt;offset&gt;]'</span></code>, or both separated by an arbitrary character. Offset is formatted as: <code class="python hljs"><span class="hljs-string">'HH:MM'</span></code>.</strong></li>
<li><strong>ISO strings come in following forms: <code class="python hljs"><span class="hljs-string">'YYYY-MM-DD'</span></code>, <code class="python hljs"><span class="hljs-string">'HH:MM:SS.mmmuuu[±HH:MM]'</span></code>, or both separated by an arbitrary character. All parts following hours are optional.</strong></li>
<li><strong>Python uses the Unix Epoch: <code class="python hljs"><span class="hljs-string">'1970-01-01 00:00 UTC'</span></code>, <code class="python hljs"><span class="hljs-string">'1970-01-01 01:00 CET'</span></code>, …</strong></li>
</ul>
<div><h3 id="decode">Decode</h3><pre><code class="python language-python hljs">&lt;str&gt; = &lt;D/T/DT&gt;.isoformat(sep=<span class="hljs-string">'T'</span>) <span class="hljs-comment"># Also timespec='auto/hours/minutes/seconds'.</span>
<div><h3 id="decode">Decode</h3><pre><code class="python language-python hljs">&lt;str&gt; = &lt;D/T/DT&gt;.isoformat(sep=<span class="hljs-string">'T'</span>) <span class="hljs-comment"># Also timespec='auto/hours/minutes/seconds/…'.</span>
&lt;str&gt; = &lt;D/T/DT&gt;.strftime(<span class="hljs-string">'&lt;format&gt;'</span>) <span class="hljs-comment"># Custom string representation.</span>
&lt;int&gt; = &lt;D/DT&gt;.toordinal() <span class="hljs-comment"># Days since Gregorian NYE 1, ignoring time and tz.</span>
&lt;float&gt; = &lt;DTn&gt;.timestamp() <span class="hljs-comment"># Seconds since the Epoch, from DTn in local tz.</span>
&lt;float&gt; = &lt;DTa&gt;.timestamp() <span class="hljs-comment"># Seconds since the Epoch, from DTa.</span>
&lt;float&gt; = &lt;DTa&gt;.timestamp() <span class="hljs-comment"># Seconds since the Epoch, from aware datetime.</span>
</code></pre></div>
<div><h3 id="format-1">Format</h3><pre><code class="python language-python hljs"><span class="hljs-meta">&gt;&gt;&gt; </span>dt = datetime.strptime(<span class="hljs-string">'2015-05-14 23:39:00.00 +2000'</span>, <span class="hljs-string">'%Y-%m-%d %H:%M:%S.%f %z'</span>)
@ -2901,7 +2901,7 @@ $ pyinstaller script.py --add-data '&lt;path&gt;:.' <span class="hljs-comment">
<footer>
<aside>June 7, 2022</aside>
<aside>June 10, 2022</aside>
<a href="https://gto76.github.io" rel="author">Jure Šorn</a>
</footer>

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