Assume the table has a column called CREATED_DATE which stores the creation date. The following SQL make use of the DATEADD() function to select records which are created within the recent 10 days.

SELECT
  *
FROM
  <YOUR TABLE>
WHERE
  CREATED_DATE > DATEADD(day, -10, getdate())

We can use different unit in the datepart (The first argument in DATEADD()) as stated in the 2nd reference link below.

Done =)

Reference:

• StackOverflow – sql query to get content older than 3 weeks
• Microsoft – DATEADD (Transact-SQL)