title: presto from_unixtime function is right?
body: <p>i make a query about bigint to timestamp and value is '1494257400'</p>
  
  <p>i will use a presto query
  but presto is not collect result about from_unixtime() function.</p>
  
  <p>hive version.</p>
  
  <p><code>select from_unixtime(1494257400)  result : '2017-05-09 00:30:00'</code></p>
  
  <p>presto version.</p>
  
  <p>Blockquote</p>
  
  <p><code>select from_unixtime(1494257400) result : '2017-05-08 08:30:00'</code></p>
  
  <p>hive gave a collect result, but presto is not collect result. how i can solve about it? </p>