DATEPART
Returns a number indicating the value of a part of a date value for a specified date.
For example, if you want the value of the month for a date, you can get a return value of 10 (for October).
Note: This function is equivalent to DATEPART in T-SQL. 
      Return Value
Integer
Syntax
DATEPART( datePart, date )
         
where:
- datePart is the part of the date
               for which you want to return the value. Possible values for this argument include
               these: 
- year - yyyy
 - month - m
 - week - ww
 - day - d
 - weekday - w
 - dayofyear - y
 - hour - h
 - minute - n
 - second - s
 
 - date references the date for which you want to return the part value.