Customer Exit Code for Fiscal Quarter

Hi,

Our company Quarter starts from March 27 2011 to June 28 2011 (1 quarter)(2012/1)

June 29 2011 to Sept 29 2011 ( 2 nd Quarter)( 2012/2)

Sept 30 2011 to Dec30 2011 (3rd Quarter) (2012/3)

etc..4th quarter (2012/4) next year first quarter (2013/1)

If user select July 3 rd 2011 ,the reports to be run from current quarter to 4 rolling quarters mean the report to be run from 2012/2-2013/1.I need customer exit ABAP code for this requirement.

Thanks,

Sridhar