title: How to update a column date of postgres to some days ahead
body: <p>Im using postgres as my database and I have a table that has a date column.
  The current value in this column is 2021-04-1 17:19:08</p>
  <p>I want to update this column's value and move the date 20 (or any other amount of days) ahead so the new value will be 2021-04-20 17:19:08</p>
  <p>the reason Im not doing it manually its because I have too much rows to move ahead so I need a query for that, and I need to freedom to choose the amount of days ahead</p>
  <p>Thanks in advance</p>