Timing in Corporate Finance Models: Distinguishing the Historical Period, Explicit Period, and Terminal PeriodDevelopment to Decommissioning: Phases in the Life of a Project Finance ModelTiming in Acquisition Models: Separating the Transaction Period, the Holding Period, and the Exit PeriodStructuring a Time Line to Measure History, Explicit Periods, and Terminal Periods in Corporate Models and Risk Phases in Project Finance ModelsComputing Start of Period and End of Period DatesTRUE and FALSE Switches in Modeling Time PeriodsComputing the Age of a Project in Years on a Monthly, Quarterly, or Semiannual BasisThe Magic of a HISTORIC Switch in a Corporate ModelTransferring Data from a Corporate Model to an Acquisition Model Using MATCH and INDEX Functions