Difference & Use of Fiscal Calendar, Depreciation Calendar and Prorate Calendar

Fiscal year where you define your fiscal year start and end date.

Depreciation calendar is the dividing the fiscal year in to different periods like 12 periods, 24 periods etc. Based on teh number of periods you define in depreciation calendar you need to run depreciation for those many periods

Prorate calendar is used only for internal depreciation calculation purpose like if you want depreciation to be based on by days then your prorate calendar has to be a daily calendar. If you want the depreciation only a monthly basis then it has to be a monthly calendar