You can always build it yourself using DATEPART...
SELECT
RIGHT('0' + CONVERT(nvarchar(max), DATEPART(m, Date_Field)), 2) + '/' +
RIGHT('0' + CONVERT(nvarchar(max), DATEPART(d, Date_Field)), 2) + '/' +
CONVERT(nvarchar(max), DATEPART(yyyy, Date_Field)) + ' ' +
RIGHT('0' + CONVERT(nvarchar(max), DATEPART(hour, Date_Field)), 2) + ':' +
RIGHT('0' + CONVERT(nvarchar(max), DATEPART(minute, Date_Field)), 2) +
RIGHT(CONVERT(VARCHAR(30), Date_Field, 9), 2)
Then you can use custom delimiters between the date and times, add seconds (or milliseconds, etc.) as you need. Wrap it in a UDF if you find the need to use it a lot.