Hi
Not sure if that's what you want but if it can help :
Formula for Month-to-date :
Start Date : =eomonth(today();-1)+1
End Date : =today()-1
Formula Year-to-date :
Start Date : =DATE(YEAR(TODAY());1;1)
End Date : =today()-1
=> For previous year, use "-364" in the cell refering to the one with the current year
=> For previous month same period,
Start Date = use "-364"
End Date : =eomonth(today();-12)
Regards