title: Epoch timestamp in Data factory
body: <p>The following is working:</p>
  
  <pre><code>responses/desc/50000/1/1525756206/json?X-apikey=542c0603951a208c4be688002d36f48808c40116174
  </code></pre>
  
  <p>But not this:</p>
  
  <pre><code>responses/desc/50000/1/@{formatDateTime(adddays(utcnow(), -6), '%a %b %d %H:%M:%S +0000 %Y')}/json?X-apikey=542c0603951a208c4be688002d3c40116174
  </code></pre>
  
  <p>Even this is not working:</p>
  
  <pre><code>responses/desc/50000/1/@{formatDateTime(adddays(utcnow(), -6), '%s')}/json?X-apikey=542c0603951a208c4be688002d3c40116174
  </code></pre>
  
  <p>So it is 
  <code>@{formatDateTime(adddays(utcnow(), -6), '%a %b %d %H:%M:%S +0000 %Y')}</code>
  vs
  <code>1525756206</code>
  vs
  <code>@{formatDateTime(adddays(utcnow(), -6), '%s')}</code></p>
  
  <p>Can anybody help me here? I have been stuck here for a couple of days. How to calculate or use seconds in data factory?</p>
  
  <p>Basically when I am using <code>@{formatDateTime(adddays(utcnow(), -6), '%a %b %d %H:%M:%S +0000 %Y')}</code>, It just ignore the filters/tag in the URL.</p>