sources linked at the end of the post.</p><br><h2 id=really-basic-examples>Really basic examples</h2><p>The <code>date</code> command by itself shows the current time. But that's rarely what I need, since I could just use the calendar widget at the bottom of my desktop screen. Perhaps useful to copy the string format and modify system time with the <code>-s</code> option?<pre class=language-ruby data-lang=ruby style=background-color:#f5f5f5;color:#1f1f1f;><code class=language-ruby data-lang=ruby><span style