title: PL-SQL to_date with timezone
body: <p>Is there a way to simply convert string date as 
  <code>2018-02-15T14:00:00+01:00</code> to oracle date?</p>
  
  <p>I tried with to_date and <code>'YYYY-MM-DDTHH24:MI:SS+01:00'</code> format but it is not valid</p>
  
  <p>Oracle always thrown 'date format not recognized'</p>