SYSDATETIME(), SYSDATETIMEOFFSET(), and SYSUTCDATETIME() don't work for SQL 2005. The examples above for conversion to the date or time data types doesn't work, as SQL 2005 only knows datetime. To get only the date portion of the current date, for example, you would have to perform some sort of mathematical calculation on the datetime value:
SELECT DATEADD(DAY, DATEDIFF(DAY, 0, CURRENT_TIMESTAMP), 0)