-STYLE TIME SPECIFICATION</a></h2>
<p>Apart from the traditional <em>Seconds since epoch</em>, RRDtool does also
understand at-style time specification. The specification is called
&quot;at-style&quot; after the Unix command <code>at(1)</code> that has moderately complex
ways to specify time to run your job at a certain date and time. The
at-style specification consists of two parts: the <strong>TIME REFERENCE</strong>
specification and the <strong>TIME OFFSET</strong> specification.</p>
<p>
</p>
<h2><a nam