WITH Q1(ID, DATE1, DATE2)
AS (
VALUES( 1 , DATE('2006-01-03'), DATE('2006-06-01')), ( 2 , DATE('2006-06-01'), DATE('2006-07-05')))

SELECT *
FROM Q1
WHERE DATE2 -  2  MONTHS > DATE1

WITH Q1(ID, DATE1, DATE2)
AS (
VALUES( 1 , DATE('2006-01-03'), DATE('2006-06-01')), ( 2 , DATE('2006-06-01'), DATE('2006-07-05')),
  ( 3 , DATE('2007-01-02'), DATE('2007-03-17')))

SELECT Q1.ID, Q1.DATE1, Q2.ID AS ID_1, Q2.DATE1 AS DATE1_1
FROM Q1
  INNER JOIN Q1 AS Q2 ON (Q1.DATE1 -  2  MONTHS > Q2.DATE1)