Get Current Date by MDX Query

NOW() is the function that gets you the current date. For example if you want to get a "measure" (let's say number of hours)  for the last year's months, then write something like:

select  [Measures].[Hrs] on 0,

Descendants(filter([D Date].[Hierarchy].[YEAR],[D Date].[year].currentmember.membervalue=YEAR(NOW())-1),[D Date].[Hierarchy].[MONTH],LEAVES) on 1

from [Cube]

Read in the following link for more examples on How To Obtain the Current Day with a MDX Query or Expression in SQL Server