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Exemple DATEADD

Example 1. Utilisation de la fonction DATEADD
DATEADD (28 DAY TO CURRENT_DATE)
DATEADD (-6 HOUR TO CURRENT_TIME)
DATEADD (MONTH, 9, DATEOFCONCEPTION)
DATEADD (-38 WEEK TO DATEOFBIRTH)
DATEADD (MINUTE, 90, CAST('NOW' AS TIME))
DATEADD (? YEAR TO DATE '11-SEP-1973')
SELECT
  CAST(DATEADD(-1 * EXTRACT(MILLISECOND FROM ts) MILLISECOND TO ts) AS VARCHAR(30)) AS t,
  EXTRACT(MILLISECOND FROM ts) AS ms
FROM (
    SELECT TIMESTAMP'2014-06-09 13:50:17.4971' as ts
    FROM RDB$DATABASE
) a
T                             MS
------------------------------------
2014-06-09 13:50:17.0000	497.1
Voir aussi :

DATEDIFF(), Opérations utilisant les valeurs de date et d'heure.