Converting datetime to YYYY-MM-DD and YYYY-MM-DD hh:mm:ss formats

I know this is trivial, but somehow I keep forgetting this.

-- YYYY-MM-DD
SELECT CONVERT(varchar(10), GETDATE(), 120)

-- YYYY-MM-DD hh:mm:ss
SELECT CONVERT(varchar(19), GETDATE(), 120)

UPDATE:

Depending on the input date format, an additional step may be necessary.

SELECT CONVERT(varchar(10),
  CONVERT(datetime, '20080730 00:00:00.000', 120), 120)