You just need to select a calendar as the 'Master planning calendar' in the Forecasting parameters. When forecasts are copied to the Final forecast model used by Master Planning, they will always be dated the first working day in each forecasting period in the calendar. For example, if you are forecasting in monthly periods and a month starts on a Sunday but the calendar specifies that only Monday-Friday are working days in each week, the Final forecast for the month will be automatically dated the 2nd of the month. If you then use a period key to split the monthly forecast into 4 weekly forecasts using Period key time intervals of 0, 7, 14 & 21 days, each weekly forecast will be dated on a Monday.
