Calculate depreciation by number of days in the following years

Dear Experts,

We are followinG the year dependent fiscal year and the start date and end date will be different for each year.

For Ex: The number of days for FY11 is 364

The number of days for FY12 is 371

The number of days for FY13 is 364

We have assets capitalized in SAP since 2007. We want to depreicate the assets for FY12 based on number days. As per the current settings of depreication key the depreciation is equally distrributing

Ex: Depreciation for FY10 is 10000

Depreciation for FY11 is 10000

Depreication for FY12 is 10000

Actually we need to calculate the depreciation based on number of days.

I simultaed on cased by activating "Depreciation to the day" check box in depreciation key but this will be working only when there is any acquisition or retirements only. this option is not working for following years.

Please help to advise is there any option to calculate depreication by number of days in the following years other than acquition year.

Thanks & Regards

************************

Kumar