title: Converting date to epoch time in clojure or jython
body: <p>I am looking for formula to convert a date to epoch time in OpenRefine. I know GREL language doesn't support this but I wonder if clojure or jython does, and if so how? </p>
  
  <p>I am not familiar with those languages at all. </p>
  
  <p>For now I am using API call with <a href="http://www.convert-unix-time.com/" rel="nofollow">this service</a>, but this is a lengthy process with large data set. </p>
  
  <p>thanks</p>