OPENINGBALANCEMONTH, OPENINGBALANCEQUARTER, OPENINGBALANCEYEAR – DAX Guide
OPENINGBALANCEMONTH: Evaluates the specified expression for the date corresponding to the end of the previous month.
https://dax.guide/openingbalancemonth/
OPENINGBALANCEQUARTER: Evaluates the specified expression for the date corresponding to the end of the previous quarter after applying specified filters.
https://dax.guide/openingbalancequarter/
OPENINGBALANCEYEAR: Evaluates the specified expression for the date corresponding to the end of the previous year after applying specified filters.
https://dax.guide/openingbalanceyear/