">val</span> add_nsec : int64 <span>&#45;&gt;</span> <a href="index.html#type-t">t</a> <span>&#45;&gt;</span> <a href="index.html#type-t">t</a></code></dt><dd><p><code>add_sec ns t</code> adds <code>ns</code> nanoseconds to <code>t</code>.</p></dd></dl><dl><dt class="spec value" id="val-sub_sec"><a href="#val-sub_sec" class="anchor"></a><code><span class="keyword">val</span> sub_sec : int64 <span>&#45;&gt;</span> <a href="index.html#type-t">t</a> <span>&#45;&gt;</span> <a href="index.html#type-t">t</a></cod