PGSQL: query does not returns a QDateTime with timezone

Given a postgresql table with a column with type timestamptz:

create table patients
 (
 patient_id serial not null,
 date_time_added timestamptz not null
 );

The table has one row with date_time_added with value 2020-08-03 12:45:34.335-03

I query the table with:

QSqlQuery query;

if(query.exec("SELECT patient_id, date_time_added FROM patients"))
{
   query.next();
   auto dTA = query.value(1).toDateTime();
   qDebug() << dTA.toString(Qt::IsoDateWithMs);
}

I would expect to see the timezone in the string, but I get the string without it. I need to manually set the time zone in order to get the right value.