title: bash - convert date time into compatible format for kibana
body: <p>I'm using elasticsearch REST API to add some data to be used in kibana dashboard.
  I have time stamps in this format <strong>2015-08-04 10:13:14</strong>. This format seems to be incompatible with kibana. </p>
  
  <p>Is there any way to convert it to something like logstash timestamps (2015-08-04T10:13:14.000Z) or any other solution to get kibana work on this?</p>