 href="../posix_time.html" title="Posix Time">Time Programming</a> 
      for more details.

    </p>
<pre class="programlisting"><span class="keyword">using namespace</span> boost::posix_time; 
    date d(<span class="number">2002</span>,Feb,<span class="number">1</span>); <span class="comment">//an arbitrary date</span> 
    ptime t1(d, hours(<span class="number">5</span>)+nanosec(<span class="number">100</span>)); <span class="comment">//date + time of day offset</span> 
    ptime t2 = t1 - minutes(<span