title: DATE_ADD example for BigQuery returning error
body: <p>Running examples from <a href="https://cloud.google.com/bigquery/docs/reference/standard-sql/functions-and-operators#datetime-functions" rel="noreferrer">BigQuery docs</a> and getting errors for intervals.</p>
  
  <p><code>SELECT DATE_ADD(DATE "2008-12-25", INTERVAL 5 DAY) as five_days_later;</code></p>
  
  <p>Returns...</p>
  
  <p><code>Error: Encountered " &lt;STRING_LITERAL&gt; "\"2008-12-25\" "" at line 1, column 22. Was expecting: ")" ... [Try using standard SQL (https://cloud.google.com/bigquery/docs/reference/standard-sql/enabling-standard-sql)]
  </code></p>
  
  <p>What am I missing here? Legacy SQL is checked.</p>