SQL & PL/SQL

Hi Team,
I need the query that must return the data of older than one month .
Means whenever i execute the query (today , tomorrow, yesterday ... ) , the query should give me result of older than one month .

Is the following query is correct !!

CREATE TABLE DATE_CHECK
(
  VAL  NUMBER,
  DT   DATE
)

SELECT * FROM 
 DATE_CHECK
         WHERE  TRUNC(dt)  < TRUNC(SYSDATE-30)

Please suggest is this correct , I tried with Sample data , It is coming as expected . I just wanted your suggestions