Return The Last 3 Months Data

Hi,

I have the following SSAS MDX query, currently taking a From & To date. How would I alter the MDX below so that just the prior 3 months data was returned for a chart of balances. I do not wish to retain the date parameters

SELECT NON EMPTY { [Measures].[EOD Book Balance] } ON COLUMNS, NON EMPTY { ([Time].[Simple Date].[Simple Date].ALLMEMBERS * [Products].[Product ID].[Product ID].ALLMEMBERS ) } DIMENSION PROPERTIES MEMBER_CAPTION, MEMBER_UNIQUE_NAME ON ROWS FROM ( SELECT ( STRTOMEMBER(@FromTimeDate, CONSTRAINED) : STRTOMEMBER(@ToTimeDate, CONSTRAINED) ) ON COLUMNS FROM ( SELECT ( { [Products].[Product Type].&[Term] } ) ON COLUMNS FROM ( SELECT ( { [Book Balance Type].[Balance Type].&[Credit Balance] } ) ON COLUMNS FROM [DailyBalances]))) WHERE ( [Book Balance Type].[Balance Type].&[Credit Balance], [Products].[Product Type].&[Term] ) CELL PROPERTIES VALUE, BACK_COLOR, FORE_COLOR, FORMATTED_VALUE, FORMAT_STRING, FONT_NAME, FONT_SIZE, FONT_FLAGS