Hello Fullen,

Assuming you'd like the number of days in the selected fiscal period, the easiest way is to retrieve the starting and ending dates for the period, subtract them and add 1. The formula to do this would be:
Code:
=(ADGET("gldates.END","C"&FPERIOD())-ADGET("gldates.START","C"&FPERIOD()))+1
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Andrew Bates