Fixed Asset - Depreciation Apportionment

Hi Guys,

i have to setup a simple straight-line depreciation.

I would like to have every month the same depreciation amount based on the useful life.

Example:  cost 10000  - period 36 -> i would like to have each period 360 of depreciation.

Unfortunately evrey month i got a slight differences based on the fact that a month is 30days and another month is 31 days.

I'm using a simple formula which is COST / USEFUL LIFE PERIOD.

How i can achive a fix value for each month?

Thank you