title: Convert mm/dd/yyyy to yyyy-mm-dd in Hive
body: <p>I have a column which has dates in the format mm/dd/yyyy. How do I convert it into yyyy-mm-dd format?</p>
  
  <p>Tried this:-
  hive> select to_date(from_unixtime(unix_timestamp('02/22/2015', 'yyyy-mm-dd')));
  but it doesn't work</p>