URL: http://www.postgresql.org/docs/7.4/static/functions-datetime.html#OPERATORS-DATETIME-TABLE

Finally I found it. How to add one year to a date in PostgreSQL

 date('now') + interval '1 year' AS today_in_one_year,
 date '2003-12-13' + interval '1 year' AS my_next_birthday ;

Both return a TIMESTAMP type.



UPDATE: It doesn't return a TIMESTAMP type, it's a DATE type (only 4 bytes).

To get a TIMESTAMP you can do this:

SELECT '2003-12-13' + interval '1 year' AS my_next_birthday;

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