How to get 18-digit current timestamp in Swift?
<p>I want to get current timestamp like this:</p>

<pre><code>636110767775716756​
</code></pre>

<p>However, when I do : </p>

<pre><code>NSDate().timeIntervalSince1970
</code></pre>

<p>It returns a value like this:</p>

<pre><code>1475491615.71278
</code></pre>

<p>How do I access current time stamp ticks in the format I want? I check the dates from <a href="http://tickstodatetime.com/" rel="noreferrer">here:</a></p>