Use the TODAY() function to obtain the current system date as a datetime value.
TODAY()
Note: The time portion of the current DateTime is ignored.
The current system date is returned as a datetime value without the time portion.
For more information on obtaining the current system date and system time, see NOW().
Using a current system date of Aug 22, 2013:
DAY(TODAY()) = 22
MONTH(TODAY()) = 8
YEAR(TODAY())= 2013