title: Convert UNIX time (INT) to timestamp in BigQuery
body: <p>I have a column "date_time" in a BigQuery table which contains unix timestamp values like "1569888224". The problem is that these values are integer data types, not timestamp data types, so I do not seem to have an easy way to convert them to human readable date/times. Does anyone have a good way of converting these integers into datetime values in BigQuery?</p>
  
  <p>Thanks!</p>