Solved - PostgreSQL: add days or hours to date

PostgreSQL does not have the DateAdd function. It uses the INTERVAL type to add days and hours to a date.

1. Add days to a date.

      select <the date> + cast(<the days> || ' days' as INTERVAL) AS nDate from <your table>;
      Or
      select <the date> + (<the days> * interval '1 day') AS nDate from <your table>;

2. Add hours to a date

      select <the date> + cast(<the hours> || ' hours' as INTERVAL) AS nDate from <your table>;
      Or
      select <the date> + (<the hours> * interval '1 hour') AS nDate from <your table>;

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