RowCreated DATETIME DEFAULT (GETDATE()) , , - , RowModified DATETIME.
AFTER UPDATE RowModified :
CREATE TRIGGER dbo.trg_YourTableUpdated
ON dbo.YourTable AFTER UPDATE
AS BEGIN
UPDATE dbo.YourTable
SET RowModified = GETDATE()
FROM INSERTED i
WHERE dbo.YourTable.ID = i.ID
END