Elemental MDX: MDX Time Series Functions: PeriodsToDate() and OpeningPeriod(), Pt. 2 In this, the second of a three-part article focusing upon the PeriodsToDate() and OpeningPeriod() time series functions, we will continue to expose member and set functions that we can use to perform analysis within the context of time. As we discussed in Part 1, many business requirements revolve around…