The forecasting period associated with the keyword plan.
| Fields | |
|---|---|
Union field 
 | 
              |
 | 
                
                  
                   A future date range relative to the current date used for forecasting.  | 
              
 | 
                
                  
                   The custom date range used for forecasting. It cannot be greater than a year. The start and end dates must be in the future. Otherwise, an error will be returned when the forecasting action is performed. The start and end dates are inclusive.  |