title: Current setting in postgresql
body: <p>I'm converting oracle to postgresql using AWS SCT tool.</p>
  <p>I found the following line in one of function:</p>
  <pre><code>select (CLOCK_TIMESTAMP() AT TIME ZONE COALESCE(CURRENT_SETTING('aws_oracle_ext.tz', TRUE), 'UTC'))::TIMESTAMP(0)
  </code></pre>
  <p>Is there any other alternative of this setting <code>aws_oracle_ext.tz</code> in postgresql? I just want to remove dependency of all the extension of aws <code>aws_oracle_ext</code>.</p>
  <p>Can I use the following one?</p>
  <p><code>select (CLOCK_TIMESTAMP() AT TIME ZONE COALESCE(CURRENT_SETTING(now()::text, TRUE), 'UTC'))::TIMESTAMP(0)</code></p>